Talk:Hebrew calendar

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Question of Passover 2019, calendar drift, and so forth.

Hi, everyone. We seem to be having an edit war here on the subject of Passover 2019. Apparently, the proponents of these edits wish to include it as an example of how calendar drift can push Passover to the second full moon after the equinox rather than the first. So ...

• Proponents: Do I correctly state the case?
• Opponents: Leaving aside for the moment the question of where in the article this might go, why is this an inappropriate or confusing example? Alternatively, is the example ok, but the wording poor? Side question: is there a year closer than 2019 when Passover falls on the second full moon after the equinox?
• Everyone: Again, leaving aside for the moment the question of where in the article this might go, am I missing anything else that is causing this edit war?

I propose we answer these questions here and come to a resolution, and then decide where (if anywhere) this edit should go.
Until we solve this here, I propose to revert any attempt to put the edit back in the article. Note that I am not taking sides—I only want to settle this without further edit warring. StevenJ81 (talk) 18:53, 21 January 2015 (UTC)

I removed it once, only because it seemed out of place. I have no specific knowledge regarding the questions asked above. It is a technical detail, a highly technical and rather minor detail, and as such seems unnecessary. Debresser (talk) 22:39, 21 January 2015 (UTC)

I hope this is where I can ask my question. It seems to me that Passover in 2016 fell on the second full moon after the equinox. The Equinox was Sun. Mar. 20. The following full moon was March 23. The next one was April 22, which was the date of Passover. So here's my question. The Jehovah's Witnesses claim to use the Hebrew calendar to determine Nisan 14, so that they can celebrate that. This year (2016) they celebrated on March 23. Did any Jews celebrate on Mar 23? I'm a bit overwhelmed by the article. --Richardson mcphillips (talk) 21:50, 12 December 2016 (UTC)

You are correct that this past Passover fell around the second full moon after the equinox. No Jew that I am aware of celebrated Passover on March 23. You need to understand the following, all of which is somehow included in the article, but might not be obvious:

• At this point, we do not use the astronomical equinox to calculate anything. Our leap years fall in years 3, 6, 8, 11, 14, 17, 19 of a given 19-year cycle, regardless of the true equinox date. At this point, Passover falls around the second full moon in years 8, 11 and 19.
• If JW use the Hebrew calendar, they should not be celebrating on March 23. More likely, they are using the principles behind the Jewish calendar, which in theory prefer Passover to be around the first full moon. Even at that, though, when the Sanhedrin actually decided the issue, the Sanhedrin was allowed to defer Passover to the second full moon, in that they could also use crop ripeness or the condition of roads as part of their decision-making paradigm. This wasn't common, but apparently did (rarely) happen.
• Further, we no longer use lunar observation to set months. Accordingly, Hebrew calendar months do not necessarily start on the day of the astronomical new moon, meaning Passover does not necessarily start on the day of the full moon. (This is true absolutely, and even more true where postponement rules (q.v.) apply.) If your almanac says that the full moon falls on Wednesday, Passover might very well start Thursday, and even possibly the following Saturday.

If this article is overwhelming, consider looking at the corresponding article in Simple English Wikipedia (that is, simple:Hebrew calendar). I was the primary writer there, and made an effort to be complete for a lay audience without letting the details of the calculations become overwhelming. StevenJ81 (talk) 00:02, 13 December 2016 (UTC)

Similarity to Turkish names of months (and perhaps Arabic).

Anyone is welcome to insert the information into the article, I just couldn't figure out how to do it best. Turkey uses the same calendar used in the Western world and the names of the months in Turkish (English in paranthesis) are -starting with the first month in the Hebrew calendar: Nisan (April), Mayıs (May), Haziran (June), Temmuz (July), Ağustos (August), Eylül (September), Ekim (October), Kasım (November), Aralık (December), Ocak (January), Şubat (February), Mart (March). Best. --Stultiwikia^{text me} 12:10, 26 January 2015 (UTC)

So 4 months, February, April, July and September are like the Hebrew names Shvat, Nisan, Tammuz and Elul. Debresser (talk) 20:13, 26 January 2015 (UTC)

High latitudes

"At higher latitudes in summer, when the sun does not sink below the horizon, a day is counted from midday to midday, and in the winter, when the sun does not rise above the horizon, from midnight to midnight."

Is that correct? Shouldn't it be the other way around? That is, when the sun is up all day, shouldn't the new day start when its at its *lowest* point, i.e., "midnight", and likewise when it's below the horizon all day, at midday? Like, the day before that prolonged daylight would begin at sunset, when the sun briefly drops below the horizon. Noon would only be 12 hours later than that, so if you're defining the day as midday to midday, then you'd have a 12-hour day when it switches from sunset to midday reckoning, whereas 24 hours after that last sunset would be the sun at its lowest point, just skimming the horizon XinaNicole (talk) 17:16, 9 October 2015 (UTC)

It contradicts the last sentence of Jewish law in the polar regions. I suggest it be removed from this article altogether. McKay (talk) 00:43, 10 October 2015 (UTC)

I agree. AJD (talk) 04:04, 10 October 2015 (UTC)

So do I. This seems counterintuitive. Debresser (talk) 16:46, 10 October 2015 (UTC)

The South Pole has to be considered, as well. — Preceding unsigned comment added by 31.53.53.130 (talk) 07:33, 20 June 2017 (UTC)

First use of the calendar?

The "History" section is vague about when the Hebrew calendar actually came into use. Since the calendar is mentioned in the Tanakh, we can imply that it was devised prior to about 450 BC, but there is no specific mention about when it was first known to be used. — Loadmaster (talk) 22:46, 5 January 2017 (UTC)

What do you mean that "the calendar is mentioned in the Tanakh"? Debresser (talk) 12:44, 6 January 2017 (UTC)

It's right there in the article, at the beginning of the "History" section:

The Tanakh contains several commandments related to the keeping of the calendar and the lunar cycle, and records changes that have taken place to the Hebrew calendar.

Also, you reverted my edit which included actual dates of when the Hebrew calendar came into use. It seems rather ironic to fail to mention the dates of a date-keeping instrument, doesn't it? Yes, the articles are linked, but surely a little redundancy amongst articles is proper. Why wouldn't we want to mention historical dates in the "History" section? — Loadmaster (talk) 15:37, 7 January 2017 (UTC)

There is a huge difference between that quote and your statement. The Tanakh contains certain instructions relating to the Jewish calendar is not the same as saying that the Jewish calendar is mentioned in the Tanakh. Debresser (talk) 16:53, 7 January 2017 (UTC)

As to the dates. First of all, one of them is only approximately. But the main issue with them is as I mentioned, that the articles are already linked, so better leave the dates to those articles. Here, is is redundant and only clouds the article with non-essential information. Debresser (talk) 16:55, 7 January 2017 (UTC)

So the simple question "When did the Hebrew calendar start being used?" is not directly answered in the article about the Hebrew calendar. Super. I think that the approximate date that the calendar was first used should be fairly essential information in a section entitled "History". — Loadmaster (talk) 18:44, 10 January 2017 (UTC)

I'm actually inclined to agree with User:Loadmaster that we should have some explicit mention of this subject within the article.

That said, I'm not sure if we really know for sure when it was first used, or even when it was first used in a form remotely resembling that used during the Mishnaic period. Religious Jews like us may assume things from primary sources, but I'm not sure what other proof may even exist. To be sure, much of our calendar seems similar to the Babylonian calendar, but again what constitutes proof I don't know. StevenJ81 (talk) 20:11, 10 January 2017 (UTC)

No problem. Just find a source and add a sentence.

Note that in his edits, Loadmaster did not try to address the question when the Jewish calendar started being used. He just added dates to some examples of usage of the Jewish calendar. A huge difference. Now he suddenly raises this issue, and only in his second post on the talkpage, but it really is not related to the edits I reverted. Debresser (talk) 20:45, 10 January 2017 (UTC)

Well, in fact, I did intend to address the question of when it began being used. It's the reason I looked up the article in the first place. Yes, my first attempt at providing a simple answer to the question was not the correct approach. But it's still the same question, though, and my original intentions were to try to provide some kind of answer. — Loadmaster (talk) 21:31, 10 January 2017 (UTC)

The question "when did the Jewish calendar first come into use" is not a well-posed question so it can't have a precise answer. Does it require a calendar with the same 19-year cycle, or does ad hoc insertion of leap-months count? Does it require month lengths defined by rules as now, or does observation of the moon count? If it means the current algorithmic calendar based on a specific epoch, a specific length for the mean synodic month, and a particular set of rules for applying these, it can't be proved that the calendar was used before the Middle Ages. Some aspects of it appeared earlier though. So the question is not so clear-cut and a useful answer is necessarily long. McKay (talk) 23:57, 10 January 2017 (UTC)

Jewish traditions says that he names of the month "came with them from Babylonia". That would probably mean what is now called "Jewish" calendar, was based on the Babylonian calendar, and accepted sometime during the 70 years of the Babylonian exile. Debresser (talk) 05:30, 11 January 2017 (UTC)

At the very least, I think we should mention the earliest (plausible) date(s) that the Hebrews started using their own calendar, separate from those of other cultures (e.g., Babylonian), even if it was not in its more refined form. That's an important timepoint in the Hebrew culture, I would think. Further, I think mentioning the evolution of their calendar, like McKay alludes to, possibly with plausible date ranges, would be informative. — Loadmaster (talk) 17:10, 11 January 2017 (UTC)

Only based on reliable source. No original research! See WP:RS and WP:OR. Debresser (talk) 17:45, 11 January 2017 (UTC)

I added parenthetical dates for the Mishnaic and Second Temple periods. Corrections are welcome. — Loadmaster (talk) 21:09, 17 January 2017 (UTC)

And I reverted you. Your sneaky or aggressive behavior, whichever, is not appreciated. Just because you reached consensus with yourself, does not mean you can now repeat an edit that was reverted and discussed here without garnering clear consensus. Debresser (talk) 21:55, 17 January 2017 (UTC)

Please remain civil. Do you have a specific problem with the addition of the dates I added? They meet your own criteria of reliable research, and do not contradict other WP articles. They simply specify when the Mishnaic and Second Temple periods took place, which are taken directly from the linked articles themselves. Mentioning the dates of the periods does not contradict the sentences they parenthetically modify, nor do they place any specific dates on the existence of the calendar itself; they simply duplicate the information in the linked articles about the historic periods. Maybe I'm misreading your intent, but you seem to be taking the position that the History subsection should not contain any mention of dates, and that readers should (only) click on the articles to find out what those date intervals are. — Loadmaster (talk) 17:01, 18 January 2017 (UTC)

Please don't make any edits without consensus, and you won't have to remind other editors to be civil to you.

I think you more or less correctly explained my position on this issue. But you left out my main point: that we should add dates, but only based on sources that pertain directly to the subject (the Hebrew calendar). Are there really no sources we can use? What with the lead I gave you here in this section a bit higher up? Debresser (talk) 18:08, 18 January 2017 (UTC)

I saw e.g. this article, which says what I stated above. Perhaps not the best source, but better than nothing. Debresser (talk) 18:20, 18 January 2017 (UTC)

→ Google translation from Hebrew to English is here. — Loadmaster (talk) 17:44, 19 January 2017 (UTC)

This very reliable source mentions it also. Debresser (talk) 18:23, 18 January 2017 (UTC)

→ Google translation from Hebrew to English is here. — Loadmaster (talk) 17:44, 19 January 2017 (UTC)

I'm a little confused. At this point, what exactly would Loadmaster like to add, and what exactly is Debresser willing to see added. StevenJ81 (talk) 18:27, 19 January 2017 (UTC)

I'd like to see any dates (or range of dates) that give some indication of when the calendar was plausibly first used by the Hebrews. If this means denoting the years spanned by a given period in which is was first used (e.g., the Mishnaic period) in place of more authoritative dates about the calendar usage per se, that would be okay. In other words, some date range that gives the reader a reasonable estimate of how old the calendar is. — Loadmaster (talk) 19:56, 19 January 2017 (UTC)

I am fine with dates, from reliable sources relating directly to the Jewish calendar. No original research along the lines of "since the calendar is mentioned here or there, and that was then and then, therefore the calendar was in existence at least since then and then". Debresser (talk) 22:39, 19 January 2017 (UTC)

External links modified

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• Added archive https://web.archive.org/web/20071125180434/http://www.geocities.com/DafAWeek/HebCal.html to http://www.judaica-frankfurt.de/content/titleinfo/177450
• Added archive https://web.archive.org/web/20071125180434/http://www.geocities.com/DafAWeek/HebCal.html to http://elkind.net/calendar/
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• Added archive https://web.archive.org/web/20071125180434/http://www.geocities.com/DafAWeek/HebCal.html to http://www.chelm.org/jewish/calendar/explain.html
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Calculating the day of 1 Tischri in Gregorian calendar

Using the Pessah formula by Gauß and Eastern formula by Lichtenberg i constructed this formula to get the day of 1 Tischri. X is the number of the hebrewan year:

A = (12X + 5) MOD 19
R = (X + 3) MOD 4


P = 20707440 + 765433A + 123120R - 1565X
Q = P DIV 492480
V = P MOD 492480


W = (Q + 3X + 5R + 6) MOD 7
K = (X + 39) DIV 100
S = (3K + 1) DIV 4 - 30
Y = 0


W:
0 ?(A>11 & V>442110) -> Y=1
1 ?(A>6 & V>311675) -> Y=2
2 Y=1
4 Y=1
6 Y=1<br

M = Q + S + Y - 31


M. Sep / (M - 30). Oct
(W + Y) MOD 7 Weekday [0=Mo]
(X - 3761) Jahr gregorian.
--87.144.190.66 (talk) 02:12, 19 May 2017 (UTC)

Thank you for the contribution. Hebrew calendar is built into the MediaWiki software platform, so we don't need to go to this trouble. But this might be useful to some users who wish to code their own work. StevenJ81 (talk) 18:16, 22 May 2017 (UTC)

No problem - i forgot to translate one word, because i have postet it on german wiki first - "Jahr" -> "year". Maybe you can find a nice place for it; here on the talk page it will be lost some day... --93.220.232.186 (talk) 00:37, 23 May 2017 (UTC)

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Samaritan Version of Calendar?

The Samaritans operate a similar version of the calendar, but out of sync with the mainstream Rabbinic Jewish Calendar. For example they celebrate Pesach on "Nissan 15-22" like Jews, but in practice this works out to be a few weeks later or earlier. I think this should be added to the Other Practices section.62.190.148.115 (talk) 14:59, 29 June 2017 (UTC)

Fair point. Give us a few days on this. StevenJ81 (talk) 15:00, 29 June 2017 (UTC)

That's six months you've been given. Any progress? 81.154.25.196 (talk) 22:42, 26 December 2017 (UTC)

Feel free to add it. Debresser (talk) 16:28, 27 December 2017 (UTC)

Please include sources. StevenJ81 (talk) 17:43, 27 December 2017 (UTC)

See https://www.israelite-samaritans.com/religion/calendar/ — Preceding unsigned comment added by 31.52.216.96 (talk) 10:26, 28 December 2017 (UTC)

 Done See Hebrew calendar § Samaritan calendar. StevenJ81 (talk) 22:46, 28 December 2017 (UTC)

Writing the year with alphabetical numbers omitting the thousands.

It would be useful to add a discussion of how the year is written. See http://self.gutenberg.org/articles/Hebrew_numerals

Otherwise it is somewhat obscure why 5777 is written תשע״ז.

Thank you very much for your consideration

Michaelaoash (talk) 07:24, 2 July 2017 (UTC)

Also a good point. Will also try to get to this during this week. StevenJ81 (talk) 18:04, 3 July 2017 (UTC)

Was already there, but I provided examples. See Hebrew calendar#writing. StevenJ81 (talk) 22:45, 28 December 2017 (UTC)

Semi-protected edit request on 3 March 2018

Could you please update this page a bit in the Months section of the Components section of this article by saying "In leap years (Such as 5779)". Please. 2602:304:5D47:EC19:4D84:3C29:4961:DBB4 (talk) 19:42, 3 March 2018 (UTC)

 Done But it seems to be very difficult for you not to have all dates in all of these articles updated to future years. 5774 was a perfectly appropriate example. Don't worry about these things so much. StevenJ81 (talk) 04:04, 4 March 2018 (UTC)

Semi-protected edit request on 20 July 2018

The Hebrew calendar month counting is not as simple and straight forward as the month table suggests as each month has two numbers associated with it.

While the number column on the page is accurate for the Hebrew sacred calendar (best to my knowledge), it does not contain the numbers for the Hebrew civil Calendar.

I have looked at 3 websites to verify my information and not a single one, including one that is maintained by a Jewish practitioner, has the both month numbers.

I have copy and pasted below the table that you do have on the page and have added a second number column and titled the number columns in respect to their civil or sacred standing.

This information should be verified with a Rabbi to ensure that I do not have the Civil and Sacred column titles reversed. Sometimes I get things wrong even when I double triple and quadruple check them. I really hate when that happens!

Civil	Sacred
No.	No.	Hebrew months	Length
7	1	Nisan	30
8	2	Iyar	29
9	3	Sivan	30
10	4	Tammuz	29
11	5	Av	30
12	6	Elul	29
1	7	Tishrei	30
2	8	Marcheshvan (or Cheshvan)	29/30
3	9	Kislev	30/29
4	10	Tevet	29
5	11	Shevat	30
6	12	Adar	29

Due to the lack of complete and verifiable information on the internet, people are confused on just how the Hebrew/Jewish calendar actually works. I don't think having both sets of numbers will make it less confusing, but it will ensure that they have the complete information regarding the calendar and the way that the months are numbered for whatever research they may be conducting.

Thanks for making the update! Source: Bottom of Page 850 of the Holy Bible Authorized King James Version PTL Partner Edition Thomas Nelson Publishers Copyright 1975 page 850 69.218.72.2 (talk) 03:44, 20 July 2018 (UTC)

You should add Adar II. Debresser (talk) 16:22, 20 July 2018 (UTC)

 Done Adar II is covered right below that table (and in several other places), so I left it alone for now. StevenJ81 (talk) 16:08, 25 July 2018 (UTC)

Hebrew Calendar abbreviated as HC

Roman calendar used AUC ab urbe condita before Jesus Christ and BC/AD Anno Domini. Hebrew calendar (HC). 73.85.207.74 (talk) 21:44, 30 September 2018 (UTC)

No. I don't think we should do that. — Preceding unsigned comment added by 2601:401:C400:357:E1B7:8159:8851:AE75 (talk) 21:45, 28 November 2018 (UTC)

Usage in Auschwitz

I think this article is very informative and helpful to people who are trying to learn more about the Hebrew Calendar. I will add a subsection called Observance in Auschwitz under the Modern calendar section. I found an interesting article called Tracking Jewish Time in Auschwitz, which appeared in a peer-reviewed journal and is written by Alan Rosen, who has a Ph.D. in literature and religion from Boston University. I will add information about the dangers of having a calendar while in Auschwitz and the importance of women making the only known surviving calendars. If anyone wants to comment on these changes, please let me know on this Talk Page or on my Talk Page. — Preceding unsigned comment added by Chloe24681234 (talk • contribs) 18:25, 30 November 2018 (UTC)

@Chloe24681234:, you might want to take a look at [1] where there are many more instances of this for many places in Europe, not just Auschwitz. I think you can use this to expand the section quite a bit. Sir Joseph ^(talk) 18:49, 30 November 2018 (UTC)

My thinking now is that with your link and my link above, the information is enough for a standalone article, Hebrew Calendar and the Holocaust, or something along that line. Sir Joseph ^(talk) 18:52, 30 November 2018 (UTC)

I would prefer that, even if only to avoid WP:UNDUE claims in this article. Debresser (talk) 15:31, 1 December 2018 (UTC)

Semi-protected edit request on 28 December 2018

In the section Implications for Jewish Ritual, don't forget to add AM 5776, the 19th year of the cycle, and Gregorian year 2016 CE. Please. 2601:401:C400:357:985:79B4:8920:1D07 (talk) 23:59, 28 December 2018 (UTC)

 Not done: please provide reliable sources that support the change you want to be made. – Jonesey95 (talk) 00:55, 29 December 2018 (UTC)

I know that in 5776(2016), which was the 19th year of the cycle, Passover was late by a month. — Preceding unsigned comment added by 2601:401:C400:357:985:79B4:8920:1D07 (talk) 02:51, 30 December 2018 (UTC)

Four Gates

The first mention in the article of the "four gates" seems to be a mistake; they do not refer to the four days that Rosh Hashana may be. The later section on the Four Gates makes it clear what they are - the four types of years in the 19-year cycle. That first mention should just be removed. MikeR613 (talk) 13:50, 20 January 2019 (UTC)

Comparison between Hebrew and Gregorian calendars

For a school project I tried implementing all the date rules as described in the article in JavaScript, but my results did not match the moladot times for the civil year given. I checked and re-checked, and they seem to be in error. I’ve replaced the moladot times for the civil year with moladot times for the ecclesiastical year (which I think may be more useful anyway) computed directly according to the rules in the article; these results seem to match those given by molad sites such as Chabad.org and TorahCalc.com. Hope I didn’t break anything. PowerPCG5 (talk) 06:11, 5 April 2019 (UTC)

As can be seen from the revision history, I replaced incorrect times for moladot Nisan with an alternative list of moladot Tishrei computed by directly applying the rules described in the article, but an anonymous editor deleted them. As I have no desire to get into an edit war with an anonymous editor, I put computed moladot Nisan back in place of computed moladot Tishrei but at least put back correctly computed values as calculated per the article and verified with the online molad calculators in the external links. I’m including my original computed moladot Tishrei (which I still think many would find more useful than moladot Nisan as computation of Rosh Hashanah forms the basis of Hebrew calendar calculations IMHO) again here for reference for anyone interested in computing Hebrew calendars on their own using the rules described in the article and wishing to check their results. Good luck, and have fun:)

Molad Tishrei 5777 (year 1 in Metonic cycle) = 14:40 ${\tfrac {4}{18}}$ Saturday, 1 October 2016

Molad Tishrei 5778 (year 2 in Metonic cycle) = 23:28 ${\tfrac {16}{18}}$ Wednesday, 20 September 2017

Molad Tishrei 5779 (year 3 in Metonic cycle) = 08:17 ${\tfrac {10}{18}}$ Monday, 10 September 2018

Molad Tishrei 5780 (year 4 in Metonic cycle) = 05:50 ${\tfrac {5}{18}}$ Sunday, 29 September 2019

Molad Tishrei 5781 (year 5 in Metonic cycle) = 14:38 ${\tfrac {17}{18}}$ Thursday, 17 September 2020

Molad Tishrei 5782 (year 6 in Metonic cycle) = 23:27 ${\tfrac {11}{18}}$ Monday, 6 September 2021

Molad Tishrei 5783 (year 7 in Metonic cycle) = 21:00 ${\tfrac {6}{18}}$ Sunday, 25 September 2022

Molad Tishrei 5784 (year 8 in Metonic cycle) = 05:49 Friday, 15 September 2023

Molad Tishrei 5785 (year 9 in Metonic cycle) = 03:21 ${\tfrac {13}{18}}$ Thursday, 3 October 2024

Molad Tishrei 5786 (year 10 in Metonic cycle) = 12:10 ${\tfrac {7}{18}}$ Monday, 22 September 2025

Molad Tishrei 5787 (year 11 in Metonic cycle) = 20:59 ${\tfrac {1}{18}}$ Friday, 11 September 2026

Molad Tishrei 5788 (year 12 in Metonic cycle) = 18:31 ${\tfrac {14}{18}}$ Thursday, 30 September 2027

Molad Tishrei 5789 (year 13 in Metonic cycle) = 03:20 ${\tfrac {8}{18}}$ Tuesday, 19 September 2028

Molad Tishrei 5790 (year 14 in Metonic cycle) = 12:09 ${\tfrac {2}{18}}$ Saturday, 8 September 2029

Molad Tishrei 5791 (year 15 in Metonic cycle) = 09:41 ${\tfrac {15}{18}}$ Friday, 27 September 2030

Molad Tishrei 5792 (year 16 in Metonic cycle) = 18:30 ${\tfrac {9}{18}}$ Tuesday, 16 September 2031

Molad Tishrei 5793 (year 17 in Metonic cycle) = 03:19 ${\tfrac {3}{18}}$ Sunday, 5 September 2032

Molad Tishrei 5794 (year 18 in Metonic cycle) = 00:51 ${\tfrac {16}{18}}$ Saturday, 24 September 2033

Molad Tishrei 5795 (year 19 in Metonic cycle) = 09:40 ${\tfrac {10}{18}}$ Wednesday, 13 September 2034

PowerPCG5 (talk) 01:16, 7 April 2019 (UTC)

Hi, @PowerPCG5:, and welcome to Wikipedia! Thank you for your interest in this topic. Unfortunately, there seems to be a problem with your edit. You say you are "interested in computing Hebrew calendars on their own using the rules described in the article and wishing to check their results". Someone has done that and found that the new rules you added don't give the correct answer (see their edit summary at the article revision history). In the example they gave for 2020 you wrote:

"Molad Nisan 5780 = 10:14 ${\tfrac {11}{18}}$ Tuesday, 24 March 2020"

Next year Nisan begins on Thursday, 26 March. Please explain how your figure gives the correct starting date. If you can't, please put the article back the way it was. Once again, thanks and happy editing! 2.27.36.48 (talk) 13:55, 11 April 2019 (UTC)

PowerPCG5 has checked the dates with two websites, and I checked a few samples and found them correct.

The molad is usually a bit before the beginning of the month, so why do see a problem here? Debresser (talk) 01:55, 12 April 2019 (UTC)

As it was, the time for 2020 (02:38 AM Wednesday, 25 March) gave the correct date for Nisan 1 of Thursday, 26 March (because Wednesday is a forbidden day). You want to use the time of the molad, 10:14 AM, Tuesday, 23 March. Please provide a worked calculation explaining how, using that time, you arrive at Thursday, 26 March for 1 Nisan. 2.27.36.48 (talk) 13:22, 12 April 2019 (UTC)

I would just like to make sure that something is clear here. @User:PowerPCG5 suggested above that the molad times for the ecclesiastical year may be more useful than the molad times for the civil year. I'd just like to remind everyone that in the current, calculated version of the calendar, the only molad time that actually has an impact in practice is the molad time for Tishri (i.e., civil year). Every other month start is simply counted off from the date of 1 Tishri so calculated at intervals of 30 or 29 days. What am I missing here? StevenJ81 (talk) 14:13, 12 April 2019 (UTC)

@2.27.36.48 Why would we want to see a calculation? This information is readily available on a variety of websites and publications. The beginning of Nissan 1 is not relevant to any of the usual calculations, so PowerPCG5 did a good thing removing that and replacing it with the molad. Which is also the beginning of the month, in a way.

@StevenJ81 The molad can be counted from any month, theoretically. But I agree that having the molad of Tishrei would be more useful, since it is indeed customary to count from Tishrei. Debresser (talk) 14:18, 12 April 2019 (UTC)

Not only customary, but under the current calendar laws, it's halacha. (I've long thought it ironic that every molad is announced in synagogue except the one for Tishrei...yet that's the only one ever used in calculations of months and years.)

The one thing that the moladot of Adar and Nissan would give us that is interesting is that we could compare them to the moment of the astronomical equinox and see which month is really "supposed" to be Nissan. But that's a very theoretical sort of thing in practice today, as it wouldn't change which month is actually Nissan. StevenJ81 (talk) 14:54, 12 April 2019 (UTC)

If you alter a table and you don't know what you are doing you will mess it up - i.e. it will no longer do what it says on the tin, which in this case is give the Gregorian date corresponding to 1 Nisan. When Debresser says "Why would we want to see a calculation?" that suggests to me that he has not verified that his new times give the correct answer. Information which has not been verified may not be included. The times in the long-standing version have been verified, so I would suggest that they be reinstated. Please don't wait for comment from Debresser as he may have gone offline for shabbos. 2.27.36.48 (talk) 15:17, 12 April 2019 (UTC)