Comment on Biggest solar flare since 2017 erupts from sun and Earth is in the firing lineparentComments−Gare1yOr maybe they mean "day" as starting from UTC midnight.−buescher1yI'd guess that's actually more likely. Interesting bit of jargon.−sevensor1yMaybe they’re contrasting with sidereal days?−chgs1yThat was my initial thought, but that’s a difference of 10 mins over 3 days, and that’s orders of magnitudes more precise than should be used.
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Or maybe they mean "day" as starting from UTC midnight.
I'd guess that's actually more likely. Interesting bit of jargon.
Maybe they’re contrasting with sidereal days?
That was my initial thought, but that’s a difference of 10 mins over 3 days, and that’s orders of magnitudes more precise than should be used.