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Asked in GSEB Board August 2020 · Snell's law, slabs and apparent depth
Given: one rotation, 360°, in 24 h=86400 s.
Idea: the Sun's march across the sky is the earth's own rotation seen from inside, so the time taken is proportional to the angle turned.
Time for one degree =(86400)/(360).
So the Sun takes 240 s — four minutes — to shift by 1°.
It is worth remembering: one degree of sky is four minutes of time.
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