#Projections for #30DayMapChallenege

An animation of 24 hours (from midnight at UTC+00:00) on Earth today, in four different projections: Left to right, top to bottom: #Orthographic, #Stereographic, Interrupted Goode Homolosine and #Spilhaus.

Plotted with #cartopy 's Nightshade function (repeated calls to get the different twilight zones) and #matplotlib at 15 minute time steps and then stacked together in #gimp

Background image is cartopy's `stock_img()`.

re-used some code I threw together recently to make a thing for changing my desktop background: https://tlohde.com/blog/2025/10/because-i-cant-afford-a-geochron/

#theTerminator #twilightZones #blog #geochron

Hopf fibration in #threejs
https://www.patreon.com/posts/hopf-fibration-137213197?utm_medium=clipboard_copy&utm_source=copyLink&utm_campaign=postshare_creator&utm_content=join_link

#math #visualization #stereographic #projection

#30DayMapChallenge 🗺️ Day 1️⃣4️⃣: A world map

Normally I would render a world map in my favorite Cahill–Concialdi projection, but I figured, why not continue to use Day 13’s new tool #D3js and render a world map in a vintage two-hemisphere #stereographic projection? (Yeah, this could also fit into Day 7’s theme.)

I am rather pleased with how this turned out. 😀

You can view the live D3-powered map here: https://30dmc.sector4f.com/map/2024-11-14

Base map is from #NaturalEarth’s 1:50m Cultural Vectors.

#DidYouKnow:In mathematics, a #Stereographic #Projection is a perspective projection of the sphere, through a specific point on the sphere (the pole or center of projection), onto a plane (the projection plane)

It maps circles on the sphere to circles or lines on the plane, and is conformal, meaning that it preserves angles at which curves meet and thus locally approximately preserves shapes.

https://knowledgezone.co.in/kbits/643a4bd54a954260a47eae49

This is about the best lighting I know how to get out of #eevee. I’m not thrilled with the shadows. I probably have a light probe at exactly the wrong spot or something? idk I don’t know a lot about eevee. I only just now managed to make glass actually transparent…

I love #stereographic video. It’s totally worth spending twice the rendering time. Shut up, it is. Pfff, what do you know, I think it’s cool.

I’m going to render it again in cycles. Eevee took a few minutes, I’ll give cycles seven hours and we’ll see what it does.