this post was submitted on 06 Jul 2024
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[–] deegeese@sopuli.xyz 7 points 4 months ago* (last edited 4 months ago) (1 children)

I had to check that math in my head.

4ly = 4yr • 3.1 * 10^7 sec/yr • 3 * 10^5 km/sec ≈ 36 trillion km

[–] i_am_not_a_robot@feddit.uk 7 points 4 months ago (1 children)

Multiply by 0.6214 to get miles = 22 trillion miles

[–] deegeese@sopuli.xyz 6 points 4 months ago (3 children)

I’m sure they have the right number. Mine was a ballpark estimate, as one does in physics. I think Proxima Centauri is about 4.2ly from Earth.

[–] chiliedogg@lemmy.world 6 points 4 months ago

"But the closest star is Sol"

[–] i_am_not_a_robot@feddit.uk 3 points 4 months ago

I was just doing the extra conversion because the comic is in miles. The figures are pretty close, and the extra .2ly would account for the discrepancy. Looks good to me!

[–] RecluseRamble@lemmy.dbzer0.com 2 points 4 months ago

Yes, too much rounding will do that (also the approximation of a year shaved off more than a percent). Taking more precise numbers, it fits:

4.2465 ly * 365.2425 days/yr * 24 * 3,600 * 299,792,458 km/s * 0.6214 ~ 24.96 e15 miles