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Peter posted an update
A question I haven’t seen before asked to calculate how much earlier or later the sun will set between two locations, where one is longitude E11921 and the other E12127. There is an example calculation in the answer:
1. Calculate the longitude difference: 121.27 – 119.21 =2.06 => 2° 6′
2. From that, convert the difference into degrees: 2.1°.
3. And complete the calculation: (2.1 / 15) x 60 = 8.4 minutes.
But how do you get 2.1° from 2° 6′?
The answer is that you must convert the minutes to degrees: 6′ / 60 = 0.1° => the total difference is 2.1°.
Jonty1 Comment-
Thanks for sharing this question Peter! While it’s unlikely to come up often, it’s an important concept to understand and one that isn’t typically covered well in textbooks. Your approach is correct, and it’s a great example of how small changes in longitude can affect sunset times. Appreciate you bringing this up!
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