A Sun-synchronous orbit is a near-polar orbit around Earth chosen so that the orbital plane precesses at almost exactly the same rate Earth revolves around the Sun, keeping the satellite's local solar time over any given latitude nearly constant from one pass to the next. This consistent lighting makes it the standard choice for Earth-observation and weather satellites, which benefit from imaging the same location under comparable sun angles orbit after orbit. The precession is achieved deliberately by exploiting the gravitational effect of Earth's equatorial bulge on a satellite's orbital plane, rather than fighting it with propellant.
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The Wikipedia Sun-synchronous orbit article, checked 2026-09-12, defines the orbit type and its uses but names no individual as having proposed or introduced it. Concept Domain Connections
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1. Wikipedia (space and spaceflight articles)
Wikimedia FoundationSun-synchronous orbit, Orbital precession sectionQuote, Sun-synchronous orbit, Orbital precession section
A Sun-synchronous orbit is achieved by having the osculating orbital plane precess (rotate) approximately one degree eastward each day with respect to the celestial sphere to keep pace with the Earth's movement around the Sun.
Sun-synchronous orbit (Wikipedia)
Wikipedia, Sun-synchronous orbit, lead paragraph
A Sun-synchronous orbit (SSO), also called a heliosynchronous orbit, is a nearly polar orbit around a planet, in which the satellite passes over any given point of the planet's surface at the same local mean solar time.
In Group: Earth Orbit Types, Lead sentence
A Sun-synchronous orbit (SSO), also called a heliosynchronous orbit, is a nearly polar orbit around a planet, in which the satellite passes over any given point of the planet's surface at the same local mean solar time.
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