STEP 1: ORBIT ELEMENTS

rE




Variable Symbol Value
Observer's Geodetic Latitude l +44.121944
Geodetic Semi-major Axis of Earth a 6378.137 km
Geodetic Semi-minor 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 (semi-major 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:
 

rE = [ cos2(l) / a2 + sin2(l) / b2 ] -1/2

rE = 6367.75 km

 
GO BACK TO STEP #2

PROCEED TO STEP #4



CASTOR HOME

SITE MAP

ZENITH METHOD

 

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