Made a visualization to answer my kid's question.
Enter your location (city, town, etc) or drag the red handle to play around.
Made with D3.js on canvas (globe) and SVG (handle).
Posted by sourdoughshploinks
![[OC] Earth's surface angular speed at your location – interactive tool](https://www.byteseu.com/wp-content/uploads/2025/04/0oks7s3hfnte1-1536x1194.png "[OC] Earth’s surface angular speed at your location – interactive tool")
Made a visualization to answer my kid's question.
Enter your location (city, town, etc) or drag the red handle to play around.
Made with D3.js on canvas (globe) and SVG (handle).
Posted by sourdoughshploinks
22 Comments
Per the sub’s rules:
Source: Formulas – wikipedia, location data api – [geonames.org](http://geonames.org)
Tools: D3 + Django
Map: land-110m from https://github.com/topojson/world-atlas
Neat. Put a toggle for kmh
Only thing I would suggest is a way to clarify cities with the same name. Having city and country only forces the user to guess.
Super cool. I love the animation of the globe as you move the needle as well.
mph!? Most people on that globe doesn’t use that. A toggle would be nice
Super cool app, would be nice to see the latitude/parallel.
But I have a question: if everyone below the ~84^(th) parallel (84°N) is already doing 88mph, wouldn’t the Delorian in *Back to the Future* trip the flux capacitor as soon as it starts moving?
https://preview.redd.it/aizveh2ejnte1.jpeg?width=1179&format=pjpg&auto=webp&s=2fb268946584f9e346ab36aa0c6291cad0fadea3
Well, that’s fun!
I would ask though for a latitude number
It’s pretty trivial to do this in your head. For example, the angular velocity in Paris is 360°/24 h. And the angular velocity of Tokyo is 360°/24 h. See? Easy.
Nice!
Two things :
I second the need for a km/h and m/s toggle (the first is used worldwide and the second is the ISO unit for speed)
Search doesn’t seem to work for me (Tried on chrome and firefox, requests seem to fire but no reaction on UI, and no error on console)
That’s not angular speed. That’s just regular speed
I think we hug-of-death’d the city lookup…
Sir, do you know why I pulled you over?
Need to denote states… there’s a billion Portlands and I want the good one. Otherwise sick.
You need to expand this XKCD style and include solar orbit, solar system orbits around sagg, Milky way blasting off…
looks like you got too many views, city search is broken 🙂
“the hourly limit of 1000 credits for whileandrey2 has been exceeded. Please throttle your requests or use the commercial service.”
Turns out 1000 searches/hr for free on geonames is not nearly enough for posting your stuff on reddit haha. It updates with another 1000 credits every hour, sorry about that!
The choice to not include major inland bodies of water is… Well it’s certainly a choice.
This is US-centric, but it needs the state in addition to the country. Lots of states have towns with the same name.
Isn’t working on FF or Chrome, doesn’t search :/
Nice job!
Minor nitpick: You’re showing tangential speed, not angular speed. Angular speed will have units of angles per unit time (e.g. radians per second).
I live at the latitude on the screenshot you posted, so I guess I didn’t even need to open the site. Cool project!
search not working but this is insanly cool
What are the consequences of the speed ?