Why do we need circular polarization for satellite communication?

When the satellite moves in space, the orientation of its antenna with respect to the receiving antenna on Earth changes continuously. Antennas with linear polarizations like vertical or horizontal polarization will not be able to receive signals if the signal radiation is perpendicular to its plane of radiation or reception. That is known as cross polarization. On the other hand in case of circularly polarized antennas, as the signal from them is also continuously rotating, effect of cross polarization is minimal. That is why circularly polarized antennas like cross Yagi, with two sets of elements perpendicular to each other, are better for Low Earth Orbit satellite communication.