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Measurement of time.
How current calendars can't match ancient Hindu timekeeping.

Why a day isn't always 24 hours long

Why a year doesn't have 365.25 days

#science #astronomy #Time
1/n
How long does a day last everyday? 24 hours? Wrong.

We define day as the time taken by Earth to complete one rotation around its axis.
But with respect to what is the measurement made? 2/n
Since Earth is also revolving around Sun while it is rotating, it needs to rotate a little extra when rotation is measured w.r.t. sun (solar day) than a distant star (sidereal day)
3/n
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