The positions of satellites in geostationary orbits can be characterized by their longitude, the longitude of a point on Earth's equator that is nadir to the spacecraft.
Satellites in GEO will sometimes enter the Earth's shadow and experience solar eclipse. Since the Earth's equator is inclined so far from the ecliptic, this eclipsing depends on the time of year as well.
Are there some simple equations that can estimate the star and end times of solar eclipse for a satellite in GEO, based on the satellite's longitude and the time of year?
Alternatively, are there resources available that can be used to make more accurate predictions?