Variable  Symbol  Value 
Observer's Geodetic Latitude  l  +44°.121944 
Geodetic Semimajor Axis of Earth  a  6378.137 km 
Geodetic Semiminor Axis of Earth  b  6356.75 km 
The radius of the Earth is not uniform over its surface. The Earth more resembles an oblate spheroid than a perfect sphere. Therefore, the equatorial radius of the Earth would not be the most accurate value when determining the satellite's orbit radius (semimajor axis), unless the observer is located right on the equator. The Earth's
radius at the observer's latitude can be found by using the following equation: r_{E} = [ cos^{2}(l) / a^{2} + sin^{2}(l) / b^{2 }]^{ 1/2} r_{E} = 6367.75 km 

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Step 3: Earth Radius Was Last Modified On December 30, 2013 