Been trying to understand how the number of daylight hours
for a given location, and given day is calculated. Was missing
a crucial definition: the Earth's declination angle. Below:
Solar Declination Angle & How to Calculate it - SolarSena
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Calculator:
.PNG)
source: National Research Council of Canada
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The math involved in the calculations need not be daunting. With
acos, one is trying to find an angle where one knows the effect. And the
effect is the conjoined result of the latitude displacement - which is constant -
and the one occasioned by the presence of the planetary tilt, which changes
every day. From there, one gets the daylight hours.
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