Tundra orbit

A Tundra orbit (Russian: Тундра) is a highly elliptical geosynchronous orbit with a high inclination (usually near 63.4°) and an orbital period of one sidereal day (about 4 minutes less than a solar day). A satellite placed in this orbit spends most of its time over a chosen area of the Earth—a phenomenon known as apogee dwell. The ground track of a satellite in a tundra orbit is a closed figure eight.