User talk:Cmglee/archive2021

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Topics started in 2021

Triangular number

The file you just inserted into Triangular number, central_polygonal_numbers.svg, has a typographical error in the caption. The term, nth, is separated into two parts: "n" and "th". I would fix it myself, but I don't know where the caption resides. The caption is evidently not anywhere that I can see in the article or the image. Where is it?—Anita5192 (talk) 23:53, 21 January 2021 (UTC)

Thanks, @Anita5192: I inserted the hair-space as Windows Firefox tends to cause italic text to overlap following text e.g. "f(V)", as it spaces characters at the baseline, even though italic characters lean to the right. Template_talk:Var and MediaWiki_talk:Common.css/Archive_16#Compensate_for_italic_lean describe the issue. As you found it problematic, I'll remove it replace it with a hyphen. I made the image as Template:Central_polygonal_numbers.svg so that it can be applied to multiple pages keeping the caption consistent. Cheers, cmɢʟee⎆τaʟκ 02:07, 22 January 2021 (UTC)

File:Solar system escape velocity vs surface temperature.svg

I'm trying to make sense of the gas velocity plots on this diagram. I've found some very similar diagrams in various other places where the gas velocities are stated explicitly as the peak or mean or rms of the maxwell-boltzmann distribution, but those figures are substantially lower than the speeds I'm seeing on your chart. For example, monatomic hydrogen (which would have the highest speeds) in Earth's atmosphere should sit somewhere between 2km/s and 5.5km/s, depending on which speed you were using and whether you were interested in average surface temperature or the temperature at the exobase where the thermal escape is actually occurring. On your diagram though, the hydrogen line crosses the Earth's surface temperature at ~18km/s. Could you tell me how you calculated that speed?

You referenced an ircamera.as.arizona.edu page which has a very similar diagram, but the workings and formulae that are with it can't actually be used to generate the velocity figures either. A similar diagram again appears on the pwg.gsfc.nasa.gov page you referenced, but its creation isn't detailed and the sources link is broken. If you could cast any light on your figures, that would be great.

Icantbelieveitsnotphysics (talk) 08:27, 20 February 2021 (UTC)

Good question, @Icantbelieveitsnotphysics: I'm unsure how Prof James Schombert came up with the values. Perhaps you can ask him at jschombe@uoregon.edu. His page has moved to http://abyss.uoregon.edu/~js/ast121/lectures/lec14.html . Good luck! cmɢʟee⎆τaʟκ 12:52, 22 February 2021 (UTC)

earth model without water

dear CmGlee..did you see my reply? Hope you can get back to me.. Best wishes

Dear CmgLee.

Love your work! and a question For an exhibition about natural history in Amsterdam we would like to 3D print your model of earth without water. We want to show the amount of fresh water available in relation to the planet. the globe will be 1,27m in diameter. scale 1:10.000.000 I hope this is OK with you. I noticed it's highly exaggerated in elevation and that the resolution is quite low. Can you tell me what magnification of elevation you used and can it be altered? Do you have a model in a slightly higher resolution?

Hope to hear from you. Kind regards — Preceding unsigned comment added by Miesio1975 (talk • contribs) 14:57, 26 March 2021 (UTC)

Dear @Miesio1975: Thanks for your interest in my STL. Sure, it's licensed under the Creative Commons CC-BY-SA 4.0 licence. If you've a link to your exhibition, I'd love to see it. The radial exaggeration is 20 times. @TilmannR: uploaded a version with higher resolution at http://commons.wikimedia.org/wiki/File:Earth_dry_elevation_2.stl . However, I found the coastlines less visible as it was smoothed to reduce the file size (the Earth has such recognisable detail that even with 600 000 faces, it still appears quite blocky). Does this better suit your needs? Cheers, cmɢʟee⎆τaʟκ 22:47, 26 March 2021 (UTC)

P.S. As a back-of-envelope calculation, a 635 mm-radius sphere has a surface area of 5.1 million mm². Even with 5.1 million faces, a face with an average area of 1 mm² (1 mm × 1 mm) would still look a bit blocky. You might need a model of around, say, 50 million faces to approach the resolution of an ordinary 3D printer.

Dear CmgLee,

Thank you very much for you quick and kind reply, (I replied earlier but something went wrong I think) The project where the globe will be shown is in the 'Groote Museum' for the Amsterdam Zoo ARTIS. It's a very old museum building which will have a modern exhibition about the relation ship between man and nature.. It will open at end of the year. (https://vimeo.com/422912124. in Dutch)

I have some other questions. • We want to show the size of the globe in comparison to the total amount of salt and sweet water on earth. The exagerration of the elevation of 20x might be a bit too much for people to understand. Is it possible to reduce it to for example 10x. You will still see elevation but less extreme. It might be less confusing for visitors. It's such a small amount of water. • The . stl model you referred to I already had and I can smoothen it using Cinema 4D but of course hat is cheating a bit but it works.. The model becomes more then 5Gb indeed. If you have a bigger model you can send it to (mail address removed) • Last question. Would you like to be creditted in the museum and if so how?

Thank you for a reply. Best wishes — Preceding unsigned comment added by Miesio1975 (talk • contribs) 08:19, 29 March 2021 (UTC)

Visualisation of the distribution (by volume) of water on Earth. Each tiny cube (such as the one representing biological water) corresponds to approximately 1000 cubic km of water, with a mass of approximately 1 trillion tonnes (200000 times that of the Great Pyramid of Giza or 5 times that of Lake Kariba, arguably the heaviest man-made object). The entire block comprises 1 million tiny cubes.

Sorry for the delay. I'll try generating a higher resolution one with lower exaggeration later today and get back to you. cheers, cmɢʟee⎆τaʟκ 09:47, 1 April 2021 (UTC)

P.S. As you mentioned water, wonder if you might be interested in this diagram.

New version

Hi @Miesio1975: I've generated a new STL with half the vertical exaggeration using a different method (Blender with Decimate Geometry) which uses a triangulated irregular network to give better resolution. With less exaggeration, coastlines are less obvious but if you paint your model, it will work well. I'd much appreciate your crediting me as CMG Lee and putting http://wikipedia.org/wiki/user:cmglee as my URL. If I can make it to your exhibition at Groote Museum after the pandemic, I look forward to meeting you. Is there any chance I could get discounted entry? ;-) Thanks, cmɢʟee⎆τaʟκ 23:45, 1 April 2021 (UTC)

Dear CMG Lee, Thank you so much!! I'm sure I can get you into the museum for free when the time comes. :-) Guided tour included.

Best wishes

My pleasure, and thank you so much too. Is the model suitable for you now? cmɢʟee⎆τaʟκ 16:05, 2 April 2021 (UTC)

Tetrahedral molecular geometry

Updated

A note to say that your diagram showing the calculation of the tetrahedral bond angle using the dot product is excellent. I have now added an explanatory paragraph to the text to clarify why this calculation is important to the article. Also I did make one minor correction to the math: I added a pair of parentheses so the text says arccos(-1/3) which is clearer than arccos - 1/3. You may wish to make the same change in the diagram, which I cannot modify because I don't have the required drawing software. Dirac66 (talk) 19:18, 10 April 2021 (UTC)

@Dirac66:  Done Thanks for adding the text. I've also made it clearer of which edges the axes are in front. Cheers, cmɢʟee⎆τaʟκ 23:50, 11 April 2021 (UTC)

Much better now, thank you. Dirac66 (talk) 01:50, 13 April 2021 (UTC)

Speedy deletion nomination of Category:Counterintuitive recreational mathematics problems

A tag has been placed on Category:Counterintuitive recreational mathematics problems indicating that it is currently empty, and is not a disambiguation category, a category redirect, a featured topics category, under discussion at Categories for discussion, or a project category that by its nature may become empty on occasion. If it remains empty for seven days or more, it may be deleted under section C1 of the criteria for speedy deletion.

If you think this page should not be deleted for this reason you may contest the nomination by visiting the page and clicking the button labelled "Contest this speedy deletion". This will give you the opportunity to explain why you believe the page should not be deleted. Please do not remove the speedy deletion tag from the page yourself. Liz ^{Read! Talk!} 14:27, 4 May 2021 (UTC)

Poor rendering of Image

Hello, roughly 9 months ago you helped me when it came to my London Assembly election maps as there was a inadvertent gaussian blur on parts of the image, due to me using the previous file for my new map c:File:Map of the 2021 London Assembly election.svg could you please help me to remove this as I don't know how to? JDuggan (talk) 20:29, 12 May 2021 (UTC)

@JDuggan:  Done I've no idea why your editor (I presume Inkscape) adds the SVG filter. Here's what I did, in case you run into this issue again in future:

• Search for feGaussianBlur.
• Note the id of the filter (not feGaussianBlur) tag it's under, in case there are other filters you wish to keep. In this instance, it's filter1031.
• Remove all references to it, vis. filter:url(#filter1031).

Hope it works for you now. Cheers, cmɢʟee⎆τaʟκ 19:05, 13 May 2021 (UTC)

Thank you very much. JDuggan (talk) 19:09, 13 May 2021 (UTC)

File:Interstellar probes trajectory.svg

Dear CmgLee,

I really love your graphics, and I’d like to ask you about your excellent plot of spacecraft and planets over the last 50 years.

I’ve been trying to produce an A1-sized map just for my own personal use, of the largest 150 solar system bodies and spacecraft out to about 150AU, where Voyager 1 currently is. It’ll be a plan view looking down from the ecliptic north pole, with distances on a quasi-logarithmic scale, using data from JPL’s Horizons ephemerides. I’d like to plot most planets’ and spacecrafts’ positions over a period of time – about 100 years for the most distant planets beyond Pluto, and over the period of one orbit for closer planets.

I’ve attached a rough sketch which I created in Microsoft Word, mainly because I don’t know how to use any other programmes, though I can use basic Photoshop and have a very basic understanding of HTML, but I don’t (yet) know anything about SVG or scripts. I’ve only plotted the approximate locations over time of the inner planets from Mercury to Saturn, but I did so using Word text boxes following a circular path. This makes it difficult to plot locations in exactly the right spot on the background circular graph paper.

Ok I tried to upload a screenshot, but Wiki says I can only upload a photo taken on a camera?! In which case how do you upload graphics created with design software? Instead I’ve uploaded my screenshot to:

https://ibb.co/yQvfhMT

So how did you create your graphic? I’m hoping there’s some magic programme where you just select a planet and the date range, then it automatically plots the circle, but I’ve just read your comment saying that you wrote a Python script, whatever that is.

Could you please let me know how you did it, what software is required, any good resources for teaching myself how to write the script, and any other tips? So far I’ve started compiling the distances and heliocentric longitudes into an Excel table; I’m not that interested in latitudes as I’m only creating a 2D plan, although I’ll probably add some symbols to indicate whether a planet is above or below the ecliptic. The only other complication is that my planned distance scale will be uneven – very roughly 1AU per square on the graph paper for the inner planets, 5AU per square for the outer planets, then 10AU per square for objects beyond Neptune.

Thanks very much! HalcyonGeezer (talk) 19:38, 3 June 2021 (UTC).

@HalcyonGeezer: Let's continue on commons:user_talk:cmglee#File:Interstellar_probes_trajectory.svg. Cheers, cmɢʟee⎆τaʟκ 00:09, 6 June 2021 (UTC)

Licensing Earth Impact Database World Map image

Hi Cmglee, I'm writing to inquire about licensing your Earth Impact Database World Map image <https://upload.wikimedia.org/wikipedia/commons/c/cc/Earth_Impact_Database_world_map.svg> Please advise as to how I can further contact you about obtaining a license to use your image for media. Thanks for your help. Lizzg21 (talk) 17:12, 1 June 2021 (UTC)Lizzg21

Hi Lizzg21,

I had replied on commons:category_talk:user:cmglee as you messaged me there:

Thanks for checking with me. The file is licensed as CC-BY-SA 4.0. Clicking Use this file on File:Earth_Impact_Database_world_map.svg gives these alternative attribution messages:

Cmglee, United States Geological Survey, Earth Impact Database, CC BY-SA 4.0 <https://creativecommons.org/licenses/by-sa/4.0>, via Wikimedia Commons

<a href="https://commons.wikimedia.org/wiki/File:Earth_Impact_Database_world_map.svg">Cmglee, United States Geological Survey, Earth Impact Database</a>, <a href="https://creativecommons.org/licenses/by-sa/4.0">CC BY-SA 4.0</a>, via Wikimedia Commons

Cheers, cmɢʟee ⋅τaʟκ 11:09, 31 May 2021 (UTC)

Hi Cmglee,

Yes, thank you so much for responding to my inquiry. I apologize for not clarifying my request in my first message, I was reaching out directly since we cannot agree to the Share Alike license you have posted this image to be licensed as. We would like to license this image from you directly for worldwide, all media, in perpetuity for our documentary series “The Secret of Skinwalker Ranch” and would like to offer you $100 as a license fee for use of this image.

If you are agreeable to license us this image for these rights and license fee, please provide me with your email address so I can send over the proper paperwork so we can generate this payment.

Thank you again for your participation in our series, we hope to hear back from you soon.

Thanks, Lizzg21 (talk) 19:09, 1 June 2021 (UTC)Lizzg21

Hi @Lizzg21:,

I'll licence the image for use only on your documentary series “The Secret of Skinwalker Ranch” if you will

1. Donate USD200 to CAMFED and send me the receipt,
2. Provide me a copy of your documentary in which the graphic is used (e.g. as a DVD or video file) for personal use, and
3. I am satisfied with the paperwork.

Can you please send me a copy of the paperwork to review?

Thanks,
cmɢʟee⎆τaʟκ 00:02, 4 June 2021 (UTC)

Hi Cmglee, Thank you for the response. We can agree to your terms. I sent you a message via Wiki email. I need your direct email address to be able to attach the license agreement. If you could please respond within 24 hours from today, June 4, 2021 at 12:00pm PST that would be much appreciated. Thanks, Lizzg21 (talk) 19:06, 4 June 2021 (UTC)Lizzg21

zinjanthropus quinquereme

zinjanthropus quinquereme

Asterisks in Generations image

Hi-

Last week a user asked a (not-very-well directed) question about the asterisks in the Generations image (see here). I never understood the purpose of these either--is there a significance I'm missing? If not, what would you think about removing them?

Thanks, Dan Bloch (talk) 22:32, 17 June 2021 (UTC)

@Danbloch: I've replied on the page: An asterisk is a genealogical symbol representing birth. According to Dagger_(typography)#Modern_usage, "The asterisk and the dagger, when placed beside years, indicate year of birth and year of death respectively." Cheers, cmɢʟee⎆τaʟκ 22:45, 17 June 2021 (UTC)

Wonderful images...

Thanks for your gorgeous images of the pool where our gods dwell and dip. I'll buy you some chips next time we're on a charabanc to Southend. No Swan So Fine (talk) 09:57, 14 October 2021 (UTC)

Hi No Swan So Fine, Thank you very much for your kind comment. If you think the one from directly beneath the pool is worthy of being a Featured Picture, may I have your support on Wikipedia:Featured_picture_candidates/Polarised_London_Sky_Pool please? Thanks in advance, cmɢʟee⎆τaʟκ 10:39, 17 October 2021 (UTC)

Thank you! 👏🏻

Hi Cmglee, I am posting this message to thank you for the fantastic illustrations you provided for the Heawood conjecture article. Your skills are fantastic! Best and gratefully, Saung Tadashi (talk) 19:48, 17 October 2021 (UTC)

Hi Saung Tadashi, Many thanks for your kind words. I was surprised to not find vector images of double torus and Klein bottle colourings on the Web so decided to add to world knowledge myself. Cheers, cmɢʟee⎆τaʟκ 23:50, 17 October 2021 (UTC)

A barnstar for you!

	The Tireless Contributor Barnstar
	Thanks for the great diagrams! Bookbrad (talk) 13:13, 26 October 2021 (UTC)

Thank you very much, @Bookbrad: much appreciated! cmɢʟee⎆τaʟκ 23:08, 26 October 2021 (UTC)

Nomination for deletion of Template:Astronomical albedo table

Template:Astronomical albedo table has been nominated for deletion. You are invited to comment on the discussion at the entry on the Templates for discussion page. WikiCleanerMan (talk) 22:37, 26 October 2021 (UTC)

A kitten for you!

I really love your graphic arts on CS and math topics! I had the privilege of using some of it :) Thank you, keep up the great work!

WikiLinuz (talk) 08:08, 8 November 2021 (UTC)

@WikiLinuz: Thank you very much! I'm glad my illustrations were helpful to you. May I ask what you use them for? Cheers, cmɢʟee⎆τaʟκ 12:24, 8 November 2021 (UTC)

I first came across this image of yours today, which impelled me to check your user page. As of now, few of the illustrations live on my user page, but I'll look more into your collections and add them appropriately in articles. WikiLinuz (talk) 12:48, 8 November 2021 (UTC)

Many thanks, @WikiLinuz:. Kind of you to call it "beautiful stuff" :-) If you know of any popular articles that could do with a (better) diagram, please let me know. cmɢʟee⎆τaʟκ 21:55, 14 November 2021 (UTC)

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≤ 2O1O	2O11	2O12	2O13	2O14	2O15	2O16	2O17	2O18	2O19
2O2O	2O21	2O22	2O23	2O24