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Reference.org
Sun-synchronous orbit
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<p>A Sun-synchronous orbit (SSO), also called a heliosynchronous orbit, is a nearly <a href="/facts/Polar_orbit/JLUlIPlq">polar orbit</a> around a planet, in which the satellite passes over any given point of the planet's surface at the same local <a href="/facts/Mean_solar_time/aYq9JqwI">mean solar time</a>. More technically, it is an orbit arranged so that it <a href="/facts/Precession/44Sk1PMD">precesses</a> through one complete revolution each year, so it always maintains the same relationship with the Sun. </p>