sentences:  Although GOES-3 ceased to be used for weather operations in 1989, it spent over 20 years as a critical part of communications between the U.S. and Amundsen–Scott South Pole Station before being decommissioned in 2016.Geostationary satellites expend fuel to keep themselves stationary over the equator, and thus cannot normally ordinarily be seen from the poles.When that fuel is depleted, solar and lunar perturbations increase the satellite's inclination so that its ground track begins to describe an analemma (a figure-8 in the north-south direction).