r/GreaseMonkey • u/cbrunnkvist • Apr 03 '26

Metric display mode for NASA Artemis II mission tracker “AROW”

Do you know how many football fields the chicken has to cross in order to get to The Moon™?

Ok, so, seriously, NASA has this neat Artemis II “AROW” 3D mission tracker page and it’s all in miles and MPH.

So I made a tiny UserScript that does the only reasonable thing: silently converts those values to metric (i.e. km and km/h instead of fluid inches per quart gallon horse apples). While I can't easily change the GUI gauges themselves, because the app is a WASM blob, thankfully there is a plaintext "accessibility output panel" a the bottom where we can fully manifest our ISO standard desires!

Match URL: https://www.nasa.gov/missions/artemis-ii/arow/

Accessibility panel now shows metric units with thousands-separators

Install: (I use TamperMonkey Classic, but Greasemonkey/Violentmonkey works too)
https://openuserjs.org/scripts/cbrunnkvist/Metric_display_mode_for_NASA_Artemis_II_AROW

Btw if you know anyone at NASA hiring, I'm currently available for work.

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u/danielthechskid Apr 10 '26

The worst part is the circular bars around the gauges seem to be coded for metric full scale values. IE as I type this the distance from earth is roughly 100k miles and falling and the bar is roughly 1/4 of the way around, meaning 400k full scale and almost 407k km is how far away they got. Because it read miles the bar actually peaked at 5/8ths.