Calculate daylight hours Based on gegraphical coordinates

Question

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 bas

Answer 1

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)           _/