User:Tomruen/archive15

triple conjunction diagram

Based on your other work at c:Category:Sky trajectories, could you make a better version of c:File:Triple Conjonction.jpg? Some of the information is inaccurate in the existing diagram, and rather than just putting a bandaid on it, I thought it would be a good opportunity to make a much better diagram. Thank you! --Lasunncty (talk) 06:57, 8 January 2021 (UTC)

Well, I went ahead and put a bandaid on it for the time being, but I still think a better diagram would be useful. --Lasunncty (talk) 08:57, 8 January 2021 (UTC)

I created an astronomically accurate map. File:Jupiter-Saturn-1981.png Tom Ruen (talk) 09:48, 8 January 2021 (UTC)

Wow, that was fast! Thanks so much! --Lasunncty (talk) 10:07, 8 January 2021 (UTC)

Nomination of Dodecagonal trapezohedron for deletion

A discussion is taking place as to whether the article Dodecagonal trapezohedron is suitable for inclusion in Wikipedia according to Wikipedia's policies and guidelines or whether it should be deleted.

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Eridian314 (talk) 14:53, 4 March 2021 (UTC)

A barnstar for you!

		The Mathematics Barnstar
		For your tireless contributions to articles on geometry and astronomy! Nrco0e (talk · contribs) 18:22, 9 March 2021 (UTC)

I removed a template

Hello! I removed a template that you added here, because it reads "Another editor has reviewed this [...]" (my italics). If you think this removal is wrong, please let me know. --Bensin (talk) 23:00, 18 March 2021 (UTC)

Nomination for deletion of Template:Total lunar eclipse contacts

Template:Total lunar eclipse contacts has been nominated for deletion. You are invited to comment on the discussion at the entry on the Templates for discussion page. A loose necktie (talk) 14:21, 24 May 2021 (UTC)

Animated GIF On May 2021 Lunar Eclipse Page

Hello. I have removed the animated GIF (and its related section) from the May 2021 lunar eclipse page as per Wikipedia:Manual_of_Style/Images#Consideration_of_image_download_size. Please will you reformat it - such as with an optimised or static thumbnail that will lead to the full size file on its image page or one of the other options listed on the Wikipedia recommendation page. Watman (talk) 00:20, 25 May 2021 (UTC)

Lunar eclipse infobox

Why did you switch the template for a table?🪐Kepler-1229b | talk | contribs🪐 23:52, 25 May 2021 (UTC)

I didn't like that it hid the times and had no graphics. Tom Ruen (talk) 23:53, 25 May 2021 (UTC)

Then are you going to change the infobox?🪐Kepler-1229b | talk | contribs🪐 00:30, 26 May 2021 (UTC)

Nomination of Bob P. King for deletion

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Rathfelder (talk) 22:56, 25 June 2021 (UTC)

Undefined notation <5,2,2>

In 2014, you added an angle bracket notation to the page List of small groups, but did not explain what the angle bracket notation meant. I have not been able to find the meaning of this notation. Would you please add a definition of the notation to the article? Comfr (talk) 19:55, 3 August 2021 (UTC)

I added some references from Coxeer&Moser. <p,q,r> are binary polyhedral groups, parallel to (p q r) polyhedral groups. Tom Ruen (talk) 20:24, 3 August 2021 (UTC)

Can you show me the polyhedron formed by alternating truncated icosidodecahedron and truncated octahedron.

Hello

I am trying to improve the Persian version of polyhedron and I needed these two. I saw you are one of the most active users in this case, so I choose to ask this question from you.

Yours sincerely, هيربد فودازى٢ (talk) 09:03, 6 July 2021 (UTC)

That would be a snub dodecahedron,

and icosahedron#Pyritohedral symmetry,

. Tom Ruen (talk) 12:07, 6 July 2021 (UTC)

Thank you for your attention. هيربد فودازى٢ (talk) 17:13, 6 July 2021 (UTC)

I used your work in File:First stellation of cuboctahedron in rhombic dodecahedron.jpg in commons

Hello,

I used your work in File:First stellation of cuboctahedron in rhombic dodecahedron.jpg in commons but I'm not sure if I'd given it a correct license.

Thanks for your attention.

Sincerely yours, هيربد فودازى٢ (talk) 17:34, 15 August 2021 (UTC)

"Inner" vertices have 10 outgoing edges and "outer" 8

@Tomruen: Since the 24-cell is a regular 4-polytope, every vertex should have the same number of direct edges. Because there is a total of 96 edges and a total of 24 vertices, there should be 96/(24/2) = 8 edges outgoing from (and incoming to) every vertex. But in the figure c:File:24-cell t0 F4.svg (or orthographically more correctly "File:24-cell to F4.svg") I count 10 outgoing edges from the vertices of the inner circle. –Nomen4Omen (talk) 13:04, 26 September 2021 (UTC)

Inner vertices are positioned coinciding on other edges. I tried marking up the 8 here. The t0 means 0th truncation (mirror 0 is active in (X)-3-(0)-4-(0)-3-(0)), being the regular 24-cell. Tom Ruen (talk) 18:21, 26 September 2021 (UTC)

O I see! There are only 8 edges going out from the inner vertices. Wouldn't it be possible to move the inner vertices a little bit further out (or in!) so that this coincidence is avoided. I assume, the approach which you have chosen in the above version would not be feasible for all inner vertices.

Thanks also for the clarification of the t0 issue. Btw., inside the SVG-file one can find the synonym "24-cell_to_F4.svg". –Nomen4Omen (talk) 19:42, 26 September 2021 (UTC)

The projection is in the 12-fold symmetry F4 Coxeter plane. If it was shifted slightly, you'd lower the symmetry, probably into 6-fold symmetry. The Coxeter plane projections can be tricky. I color vertices if coinciding, red=1, orange=2, etc. Edges are transparent, so they do look darker when overlapping so a small hint. But if a vertex is sitting on another edge, it takes more sleuthing to clarify, like I did with my drawing above. Tom Ruen (talk) 10:13, 27 September 2021 (UTC)

Also it may produce unsatisfactory results.

Maybe it is clearer, if those edges in the figure which run over and not into a vertex are broken into two lines which circumvent that vertex ?

–Nomen4Omen (talk) 13:54, 27 September 2021 (UTC)

It could look like this:

I understand why you might like to do this, but I must prefer purity of geometry - it is what it is. There are many polytopes with the same projections List_of_F4_polytopes, getting progressively more overlapping elements in B4, B3, and B2 Coxeter planes. It's just not something to fix. Feel free to add comments in a given usage if you think it'll help clarify. Tom Ruen (talk) 18:26, 27 September 2021 (UTC)

Color coding coincident vertices for 2D projections of polytopes

Hello Tom,

Thanks for the drawings you provided at https://en.wikipedia.org/wiki/120-cell#Orthogonal_projections and https://en.wikipedia.org/wiki/600-cell#2D_projections. They have been very helpful in my recent work. Specifically, the color coding of the vertices to indicate the number of coincident vertices was most helpful to me. The fact that edges are transparent, so they look darker when overlapping, was not obvious so thanks for pointing that out above.

Some of the projections obviously have no coincicent vertices so all 120 vertices are shown in red. I was able to reverse engineer the color code for 600-cell_t0.svg and discovered that red represents a single vertex, orange coresponds to 2 coincident vertices and yellow coresponds to 4, so we have (4 red * 1 = 4) + (24 orange * 2 = 48) + (17 yellow * 4 = 68) = 120 vertices as expected.

However, in the case of 600-cell_t0_A2.svg, the same color code does not add up to 120 vertices. Instead, we have (6 red * 1 = 6) + (24 orange * 2 = 48) + (7 yellow * 4 = 28) = 82, not 120.

Similarly, 600-cell_t0_H3.svg, does not add up to 120 vertices either. Instead, we have (10 red * 1 = 10) + (20 orange * 2 = 40) + (1 yellow * 4 = 4) = 54, not 120.

Three of the similar projections on the 120-cell page have coincident vertices as indicated by the various colors. Since my immediate interest is in the 600-cell, I have not yet tried to evaluate their color codes except to note that some of them have as many as 4 colors including green which is not used on any of the 600-cell projections.

I assume that the colors used in the various projections are correct in that all vertices of a given color within a single drawing will all have the same number of coincident vertices, but it seems that the number of coincident vertices represented by a particular color is inconsistent from one drawing to the next (with the likely exception of red=1).

Could you possibly indicate the meaning of each color, either in the drawings themselves or better yet, use a consistent color code across all of the drawings and then document the meaning of the color code as text somewhere on the pages that use the drawings?

I understand that these changes may require a non-trivial investment of your time, so in the interum, could you at least, point me to the interpretation of the colors for the two files I mentioned above on the 600-cell page since those are the two of immediate interest to me?

Thanks again for your efforts.

David42Hall (talk) 22:58, 29 September 2021 (UTC)

Hi David. Yes, it was something I thought about after I generated them all, some of them I might have added overlap-counts as SVG comments. Your deductions are correct, spectral colors red, orange, yellow, green,... sequence progressively more overlaps, but not specific counts. So might be 1=red, 2=orange, or could be 1=red, 3=orange or even 8=red! Using a consistent color would have been problematic since could be high degree. I agree, like for File:600-cell_t0_H3.svg, 10 red, 20 orange, 1 yellow, we have 10R+20E+1Y=120, and R<E<Y, but hard to deduce from that. Tom Ruen (talk) 08:16, 30 September 2021 (UTC)

I added color counts to 120-cell#Orthogonal_projections and 600-cell#2D_projections. Tom Ruen (talk) 09:08, 30 September 2021 (UTC)

Thank for for adding the specific counts on the 600-cell and 120-cell pages as well as the explanation you provided here. I see why developing a consitent color scheme would generate its own set of problems but you've answered my immediate questions.

David42Hall (talk) 04:06, 4 October 2021 (UTC)

Nomination for deletion of Template:Omnitruncated hypercube polytopes

Template:Omnitruncated hypercube polytopes has been nominated for deletion. You are invited to comment on the discussion at the entry on the Templates for discussion page. WikiCleanerMan (talk) 20:10, 2 November 2021 (UTC)

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Nomination of Tetracontaoctagon for deletion

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Danstronger (talk) 18:42, 4 December 2021 (UTC)

Nomination of Icosidigon for deletion

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Nomination of Enneadecagon for deletion

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Ranked Choice Voting

Tomruen,

You added some images to the Ranked voting page. What do you think of this image, I got from the USA State of Maine ballot?

Myclob (talk) 23:30, 29 December 2021 (UTC)

It looks good. Are there any instructions included along with the ballot? Tom Ruen (talk) 23:48, 29 December 2021 (UTC)

File:1994 PC1 skypath 2022.png

Hello!

The hour labels change in the opposite direction to the day labels. This looks like an obvious error. Can you improve? Thank you in advance! ((7482) 1994 PC1)

--Wiklol (talk) 12:58, 6 January 2022 (UTC)

Image request

Hi,

Do you mind that I ask you to create an image of C/2014 UN271's skypath for its article? I'm in the middle of expanding the page, so having one of your detailed astronomical diagrams would be greatly appreciated. Nrco0e (talk · contribs) 07:38, 14 February 2022 (UTC)

How does this look? File:Comet-C2014-UN271-skypath.png Tom Ruen (talk) 17:56, 14 February 2022 (UTC)

Looks great! Thank you very much. Nrco0e (talk · contribs) 19:56, 14 February 2022 (UTC)

E8 Quasicrystals

Hi Tom.

A long time ago I asked for your help understanding this orthogonal projection which you calculated. My motivation was to take the Fourier transform of the projected vertices (as Dirac deltas). I recently uploaded a Youtube video showing continuous rotations between the orthogonal projections on the 4_21 polytope page. This structure shows up at 1m11s. I explain some of the details in the description.

I thought you might be interested to see the result. One idea I have to further improve the video is to show the projected (pre-Fourier transform) vertices moving around as the plane/structure rotates. I would be appreciative if you could teach me how you made those figures. Right now I am stitching many still frames together, but a more elegant animation method might be better for that aspect of the video.

Thanks,

OzoneNerd (talk) 17:57, 17 March 2022 (UTC)

Hi OzoneNerd. Interesting video, outside my knowledge. I don't know if I have any helpful suggestions. Tom Ruen (talk) 19:09, 20 March 2022 (UTC)

Proposed deletion of File:Tomruen test.svg

The file File:Tomruen test.svg has been proposed for deletion because of the following concern:

unused test image

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Symbols of uniform polyhedra

Hello,
I translate articles about polyhedra on the Romanian Wikipedia. For example, the article truncated tetrahedron shows the uniform polyhedron symbol U₀₂, but the polyhedron is listed at #3. Can you enlighten me on what U₀₂ means? Thank you. Turbojet (talk) 09:24, 31 March 2022 (UTC)

They are indices from various lists. The U indexing (1-80) is used by MathWorld. https://mathworld.wolfram.com/UniformPolyhedron.html

See List_of_uniform_polyhedra#Column_key

Tom Ruen (talk) 10:03, 31 March 2022 (UTC)

Thank you. Turbojet (talk) 11:46, 31 March 2022 (UTC)

Templates created

Hi, Tom, I've come across a few templates you created from the unused templates report. Do you plan on using these templates that have been sitting around for the past decade somewhere on Wikipedia because if not could you move it as a subpage of yours like you did from the November 2, 2021 Tfd? --WikiCleanerMan (talk) 23:20, 9 April 2022 (UTC)

If you list them, I can move them to a talk page or blank them for deletion. Tom Ruen (talk) 00:20, 10 April 2022 (UTC)

Template:Hosohedra, Template:Rhombic figure table, and Template:Lunarsaros db from your alternative account. Also, if you do plan on using them, please add a category to Hosohedra. Makes things easier for finding templates through category space. --WikiCleanerMan (talk) 01:36, 10 April 2022 (UTC)

You blanked Rhombic figure table. Do you want it deleted? If so you can nominate under G6. --WikiCleanerMan (talk) 14:57, 10 April 2022 (UTC)

Found this one: Template:Order-7 regular tilings. --WikiCleanerMan (talk) 01:42, 12 April 2022 (UTC)

Template:Hypercube polytopes found. In order to avoid me from keep posting more I find. From both of your accounts, I recommend going through your creations regarding templates through your contributions by using the specific filters. From there you'll be able to check which are used and unused to avoid them appearing on the unused templates reports. Hope this helps. --WikiCleanerMan (talk) 23:16, 15 April 2022 (UTC)

Proposed deletion of The Lexington Project

The article The Lexington Project has been proposed for deletion because of the following concern:

Merge proposal from over a year ago going nowhere... how about deletion? This was a proposed plan that made a little bit of news in June 2008 but has no sustained coverage, fails WP:10YT / WP:LASTING / WP:GNG, and doesn't need an article or to redirect to the 2008 campaign article.

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"Enneacontagram" listed at Redirects for discussion

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Nomination of Heptagrammic prism (7/2) for deletion

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1234qwer 1234qwer 4 14:47, 8 May 2022 (UTC)

Nomination of Heptagrammic prism (7/3) for deletion

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1234qwer 1234qwer 4 14:47, 8 May 2022 (UTC)

Nomination of Enneagrammic antiprism for deletion

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1234qwer 1234qwer 4 15:08, 8 May 2022 (UTC)

Nomination of Dodecagonal antiprism for deletion

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1234qwer 1234qwer 4 16:06, 8 May 2022 (UTC)

Nomination of Hendecagonal antiprism for deletion

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1234qwer 1234qwer 4 16:15, 8 May 2022 (UTC)

Proposed deletion of The Lexington Project

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Nomination of Lunar Saros 163 for deletion

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Ｑ₂₈ (talk) 09:17, 13 July 2022 (UTC)

Blaschke sum

Please stop trying to illustrate Blaschke sum by images that depict Minkowski sums. They are different topics. Your attempts at original research are introducing errors into the encyclopedia. —David Eppstein (talk) 17:39, 27 August 2022 (UTC)

I apologize for my confusion. I added a statement they are the same for convex polygons in the plane, with one illustration. Tom Ruen (talk) 20:23, 27 August 2022 (UTC)

Uniform star tilings

Hi, would it be possible for you to make an extension to File:Twenty one uniform tiling vertex figures.png listing vertex figures for 15 more uniform star tilings with apeirogons listed by Grünbaum et al.? I've already put them at Uniform tiling#Expanded lists of uniform tilings (the cases at the bottom: 2.1–2.3, 2.8–2.13, 2.18–2.23). Double sharp (talk) 16:09, 10 September 2022 (UTC)

A barnstar for you!

	The Original Barnstar
	i like your shapes tom! - Stolenshortsword (talk) 11:09, 18 September 2022 (UTC)

Nomination for deletion of Template:Deltoidal table

Template:Deltoidal table has been nominated for deletion. You are invited to comment on the discussion at the entry on the Templates for discussion page. —David Eppstein (talk) 00:27, 24 October 2022 (UTC)

Image request: Sednoids update

Hi, could you please update your graphics File:Sednoid orbits.png and File:Sednoid apparent magnitudes.png to include Leleākūhonua's name and the newly-discovered fourth sednoid 2021 RR205? Thanks! Nrco0e (talk) 02:59, 4 November 2022 (UTC)

What does the color scheme for this table mean?

I am not quite sure what the color scheme for Template:Regular honeycomb table means, but it does not seem to match the color scheme given in the key. 2601:647:5800:4D2:AD3F:A018:EA26:6861 (talk) 19:51, 19 November 2022 (UTC)

Boerdijk–Coxeter helix illustrations

Thank you for your edits improving my photo of a magnetic-stick model. I didn't have the expertise to create a rendered model as you did for the Boerdijk–Coxeter helix article. I transcluded your excellent illustration there into the 600-cell article, where I found your colorings of the various edges and chords very necessary to refer to (in my explanatory Efn footnotes about the 30-cell rings of the 600-cell). Did you happen to see my comment on the Talk page of your Wikimedia Commons image file? (That was probably the wrong place for me to put it.) I think there is a small graphical error in the coloring of three of those edges. Dc.samizdat (talk) 23:57, 23 November 2022 (UTC)

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Sedna FAR

Sorry to trouble you but Sedna's interminable FAR has roped in two of your images: File:Sednoid apparent magnitudes.png, File:Sednoid orbits.png

They want to know the sources you used, Please can you do what you can. At this point I think people are just looking for an excuse to demote it. Serendi ^podous 12:02, 10 December 2022 (UTC)

I put info to File:Sednoid apparent magnitudes.png. I don't know where any dialogue exists. I see 2021 RR205 should be added. Tom Ruen (talk) 23:07, 10 December 2022 (UTC)

Wikipedia:Featured article review/90377 Sedna/archive1 Serendi ^podous 09:47, 11 December 2022 (UTC)

Proposed deletion of Heptagrammic antiprism

The article Heptagrammic antiprism has been proposed for deletion because of the following concern:

(as an alternative to WP:G14). Given the result of Wikipedia:Articles for deletion/Heptagrammic antiprism (7/2), Wikipedia:Articles for deletion/Heptagrammic antiprism (7/3), Wikipedia:Articles for deletion/Heptagrammic crossed-antiprism was to delete. There is no suitable target for a redirect (not mentioned at Antiprism).

While all constructive contributions to Wikipedia are appreciated, pages may be deleted for any of several reasons.

You may prevent the proposed deletion by removing the {{proposed deletion/dated}} notice, but please explain why in your edit summary or on the article's talk page.

Please consider improving the page to address the issues raised. Removing {{proposed deletion/dated}} will stop the proposed deletion process, but other deletion processes exist. In particular, the speedy deletion process can result in deletion without discussion, and articles for deletion allows discussion to reach consensus for deletion. Shhhnotsoloud (talk) 13:04, 30 December 2022 (UTC)

Nomination of Decagonal trapezohedron for deletion

A discussion is taking place as to whether the article Decagonal trapezohedron is suitable for inclusion in Wikipedia according to Wikipedia's policies and guidelines or whether it should be deleted.

The article will be discussed at Wikipedia:Articles for deletion/Decagonal trapezohedron until a consensus is reached, and anyone, including you, is welcome to contribute to the discussion. The nomination will explain the policies and guidelines which are of concern. The discussion focuses on high-quality evidence and our policies and guidelines.

Users may edit the article during the discussion, including to improve the article to address concerns raised in the discussion. However, do not remove the article-for-deletion notice from the top of the article until the discussion has finished.

1234qwer 1234qwer 4 03:06, 31 December 2022 (UTC)