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I want to calculate Daylight hours based on given Latitude and Longitude and DateTime
I mean calculate the time of sunrise and the time of sunset in a specefic Date and based on gegraphic coordinate.
969
Multiply the tangents of latitude and declination angle. Find the cosecant inverse for the negative of the product. Multiply the resultant with -1 to get the hour angle for sunrise.
Sunrise/Sunset Calculations Then the UTC time of sunrise (or sunset) in minutes is: sunrise = 720 – 4*(longitude + ha) – eqtime where longitude and hour angle are in degrees and the equation of time is in minutes.
your location on Earth—as described by longitude and latitude‰is linked to the day and night cycle. You will build understanding of how the Earth's rotation and shape affect the 24 hour cycle of darkness and daylight.
Length of a day describes the moment from when the up- per limb of the sun disc appears above the horizon during sunrise, to the moment when the upper limb disappears below the horizon during the sunset.
Check this Latitude and Longitude and Daylight Hours
D = daylength
L = latitude
J = day of the year
P = asin[.39795*cos(.2163108 + 2*atan{.9671396*tan[.00860(J-186)]})]
_ _
/ sin(0.8333*pi/180) + sin(L*pi/180)*sin(P) \
D = 24 - (24/pi)*acos{ ----------------------------------------- }
\_ cos(L*pi/180)*cos(P) _/
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