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Finding Latitude Of The Observer At Meridian Transit

What is the latitude of a place where the sun is at the zenith of observer at local apparent noon of June 21 or 23?

Given:
            Date: June 21 & 23

Find:
            Latitude of the observer

Solution:

              June 21 or 23 is summer solstice, and the declination of the sun on this date is 23° 27' N.

        If the Sun is at the Zenith it means that Altitude( Ho) = 90°
                                                                                       -  90° 
                                                                                ZD  =  0°
                           Declination of  the Sun on June 21/23    = 23° 27’ N 
                                                                                Lat  = 23° 27’ N

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