Geo-synchronous orbits are those orbits in which
object revolves in the same time as taken by earth rotation on its axis. Hence,
an object in geo-synchronous will always appear stationary at all times from
earth. A geo-stationary orbit is a geo-synchronous orbit exactly above equator.
With fixed latitude & eccentricity, satellites placed in geo-synchronous
orbit will give easy information on weather & communication without
monitoring the antenna for signal every single time.
On the other hand,
a sun-synchronous orbit faces sun at all times in such a way that an object in
its orbit appears ascending or descending from earth at same position at same
local time every day. This is because for an object in sun-synchronous orbit, surface
illumination angle matches mean solar time also sometimes called as sidereal
day of earth. Since it is always lighted, satellite in sun-synchronous orbit is
best-suited for Earth observation purposes such as Remote sensing giving a
clear & bright view of earth at all times from its imagery.
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