RECOMMENDATION ITU-R S.1525-1 - Impact of interference from the Sun into a geostationary-satellite orbit fixed-satellite ...
ANNEX 1 - Calculation of the level of interference from the Sun into a GSO FSS link
1 General approach
2 Application of the methodology to different antenna sizes
3 Variation during a day
ANNEX 2 - Simplified method to calculate the Sun transit period for a GSO earth station
1 Introduction
2 Satellite ephemeris data
3 Predicted Sun transit periods
    3.1 Coordinate system for calculating Sun transit
    3.2 Calculating the coordinates of the Sun
    3.3 Calculating the right ascension of the Sun
    3.4 Calculating the time of Sun transit
    3.5 Approximate values
    3.5.1 The number of affected days
    3.5.2 The maximum duration
    3.5.3 Total duration at each equinox