Moscow_hours

 

Moscow, Russia seems to be having a moment, with really nice weather.

Decided to work through the hours of daylight formula for myself.

For angle of declination:

                                                                   

For the geometric calculation:

                                                                           

So the formula is on!!

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At equinox:

https://youtu.be/c9y5nwok1to

Got the refraction adjustment procedure: the formula for Ѡ below, when multiplied

by 2/15, gives a day of 24.37 hours, Thus 1.01542 of 24. Apply that to our minutes

reading and we go from 31 to 45 minutes...

                                                                      

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Daylight Calculator (omnicalculator.com)

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I'm still off by two minutes from the Microsoft Weather readings. I used

55.75 as the altitude reading and ignored the 21 seconds. Probably bang on...