Talk:Earth

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Q. Why doesn't the article say anything about the apparent uniqueness of life on this planet?
A. At one time the lead said, "Home to millions of species, including humans, Earth is the only place in the Universe where life is known to exist." There were similar assertions in the article body. However, the wording proved too contentious and a stable compromise couldn't be achieved. Instead, it was decided to remove all mention of this point and leave the discussion of life elsewhere to the extraterrestrial life article.[1]
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A. This article focuses on the scientific consensus about the Earth. Per WP:PSCI, fringe theories about the Earth need not be given equal weight. Such views normally have their own well-developed articles where there is more weight given to presenting the specific philosophies.
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A. There are multiple reasons. The image is iconic, famous and is one of the few true photographic images of Earth. It has also been a featured image since November 2004. Other images may present more detail of the land masses, but they are generally composite or processed images.
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Wrong value of Equatorial and Prime meridian?[edit]

From this text "Earth" and from this other https://en.wikipedia.org/wiki/Equator , to have doubtful exact values ​​of Equatorial and Prime meridian, in each values the number of meters is very different surpassing variations of 10 meters. — Preceding unsigned comment added by Rmbeer (talkcontribs) 06:26, 9 August 2017 (UTC)

Earth is not "otherwise known as the Globe"...[edit]

The phrase "the globe" refers to a model of the Earth, as discussed in the article for Globe. — Preceding unsigned comment added by 206.40.111.98 (talk) 19:24, 21 June 2017 (UTC)

I'm unhappy with most of the old lead paragraph. I've made a proposal on the article. Power~enwiki (talk) 17:33, 30 July 2017 (UTC)
I agree with the removal of the metaphor "globe", and SF words for the earth. You seem to have also removed some references for the age. Was there a reason for this? It's not quite a "grass is green" statement. Dbfirs 19:31, 30 July 2017 (UTC)
I don't believe I did; some references from the second paragraph are in the lead. Please feel free to restore any references I removed. Power~enwiki (talk) 19:34, 30 July 2017 (UTC)
Apologies, I seem to have mis-read your edit. All is well. Thank you for your improvement to the article. Dbfirs 06:36, 1 August 2017 (UTC)

Orbital Period[edit]

The Orbital Period of Earth, as verified in the link provided below, is not 365.26 days but is rather 365.24 days.

https://nssdc.gsfc.nasa.gov/planetary/factsheet/earthfact.html

The page is locked, so this information can't be flagged as disputed.

The sidereal year (which is relevant here) is really about 365.26 days long. 365.24 days make up a solar year. Double sharp (talk) 23:25, 4 September 2017 (UTC)

Average elevation of land[edit]

Continuing the talk section https://en.wikipedia.org/wiki/Talk:Earth/Archive_9#Average_elevation_of_land The currently given Wikipedia value for the average elevation of the land is 840m. But that value has apparently been copied from source to source since 1921 or before. They hadn't even mapped the topography of the world accurately back then. An apparently newer number which looks more trustworthy is found in a hypsometric curve graph at https://globalchange.umich.edu/globalchange1/current/lectures/topography/topography.html It appears that curve must have been calculated with a computer and thus probably used modern satellite data. And since it states the average as 841m, it is apparently not just derivative of the 840m number. I'm going to update the article with the 841m number and a reference to that page. Mindbuilder (talk) 19:17, 13 September 2017 (UTC)

Ah. The "841" comes from an image [2] on the page, which is why I didn't notice it earlier. I still don't think that claiming this value is exact to the order of 1 meter is accurate or useful. Power~enwiki (talk) 00:14, 14 September 2017 (UTC)

But now I've found a source http://onlinelibrary.wiley.com/doi/10.1029/2008JB006176/full which says "The value of average continent elevation above sea level at present is 0.835 km. Both these values are from Turcotte and Schubert [2002]." I'm not sure if continent elevation is the same as all land elevation. And I'm not sure how thick ice shelfs over the ocean are dealt with. At any rate, we're only talking about 6m here. Mindbuilder (talk) 22:41, 13 September 2017 (UTC)

Schubert says he doesn't remember where they got the 835m number. I found a hypsographic curve from NOAA https://globalchange.umich.edu/globalchange1/current/lectures/topography/topography.html that gives 797m as the land average. It says its land elevation data from ETOPO1 has accuracy no better than 10m. NOAA talks about its data sources for both the elevation of the Antarctic and Greenland ice caps and the bedrock beneath, but I didn't notice them saying which they used for the average.
This hawaii.edu hypsometric curve https://laulima.hawaii.edu/access/content/group/2c084cc1-8f08-442b-80e8-ed89faa22c33/book/chapter10/crust.htm gives 875m as "average elevation of exposed land". Mindbuilder (talk) 03:37, 15 September 2017 (UTC)
This article has a good discussion of Earth radius and average land height.
http://frederic.chambat.free.fr/geophy/inertie_pepi01/article.pdf
It makes it clear that the 840m and higher values are no longer likely enough to be worth mentioning. The 875m value is from way back in 1933. Unfortunately the Chambat article doesn't give its current value for average land height but only how much the land height adds to the average radius. Without knowing exactly what fraction of the planet he considers to be land it doesn't give us a specific value for average land height. The only specific modern value for average land height I can find is 797m at the NOAA page https://ngdc.noaa.gov/mgg/global/etopo1_surface_histogram.html It's consistent with Chambat2001 and is based on an even newer 1 minute digital elevation model. I have no credible source for any other specific value or significantly different range, so I'm going to put just 797m in the article. Mindbuilder (talk) 04:14, 18 September 2017 (UTC)
I don't really like putting three significant digits on this 797m number. But if I round it I'd have to round it to 800m, and then people might think there was only one significant digit. Even worse, if we round it to 800m people might think we rounded 840m to 800m and they might go with the 840m number thinking it is more precise. Besides, while the 7 is a digit of very little significance, it probably does have a little bit of significance, so it seems fair, if only barely, to put it in. Another way we could do it is to list it as .80km, but I don't like that either. Mindbuilder (talk) 04:43, 18 September 2017 (UTC) Mindbuilder (talk) 20:48, 18 September 2017 (UTC)
I don't quite see the problem with using the 797 figure. If it seems overly precise, perhaps we could do "797 ±10m". –dlthewave 01:56, 19 September 2017 (UTC)

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Semi-protected edit request on 12 October 2017[edit]

The earth is only about 6,00 years old and NOT 4 billion years old. The bible states that the world is about 6,000 years old and the scientist even say things that prove that the bible it true. Sh4vida (talk) 14:45, 12 October 2017 (UTC)

Not done: The bible is a unreliable mythical story, not an evidence-based WP:RS source for an encyclopedia. Please read Age of the Earth and check the sources. --Zefr (talk) 15:08, 12 October 2017 (UTC)