Explain polar satellite . 

Explanation

`implies` Another class of satellite are called the polar satellite.
`implies ` These are low altitude `(h ~~ 500 " to " 800 `km from the surface of earth) satellite but they go around the poles of the earth in a north-south direction whereas the earth rotates around its axis in an east-west direction.
`implies ` Its time period is around 100 minutes it crosses any altitude many times a day.
`implies ` A camera fixed on it can view only small strips of the earth in one orbit.
`implies ` Adjacent strips are viewed in the next orbit.
`implies ` Hence, in effect the whole earth can be viewed strip by strip during the entire day.
`implies ` These satellite can view polar and equatorial regions at close distances with good resolution.
`implies ` Information gathered from such satellites is extremely useful for remote sensing, meterology as well as for environmental studies of the earth.