Polar orbits pass over the north and south poles of the Earth.
Polar satellites, orbiting over the polar region (first link), takes approximately 100 minutes to do one complete pass at 25-degrees Earth rotational difference, to map the full section.(second link)For other satellites, it can take 90 minutes just to re-position a satellite to cover a new region, and THEN begin mapping. But the polar satellites stay in a constant orbit.
The main type of satellites are: 1) Geostationary 2) Polar
Phobos is 48,340,000 miles from the planet Earth. Phobos is one of two satellites of Mars and was first discovered in 1877.
Circum polar satellites.
Polar orbits pass over the north and south poles of the Earth.
Polar Orbiting.
for giving information to places on earth that is far far away.
The moon, at an average distance of 238,860 miles.
Polar satellites, orbiting over the polar region (first link), takes approximately 100 minutes to do one complete pass at 25-degrees Earth rotational difference, to map the full section.(second link)For other satellites, it can take 90 minutes just to re-position a satellite to cover a new region, and THEN begin mapping. But the polar satellites stay in a constant orbit.
A satellite in a polar orbit orbits from north to south. As the earth turns, it passes over all the surface area of the earth. Therefore, polar orbits are ideal for detecting things on the planet's surface.
It takes that many to provide complete coverage of the Earth, including the polar regions.
Artificial satellites come from all over the world. Each country send their own satellites into space.
This allows them to see the entire surface of the Earth. The Earth is rotating East to West. (Or West to East if you were the satellite.) If you placed a satellite into an East-West orbit, it would not see the polar regions. If it were high enough (geo-stationary), it would only see one spot on the Earth. By using North-South (polar) orbits, the satellites will, after several orbits, be able to see the entire surface of the Earth.
It is used for communication plates where geostationary satellites can't reach, in polar areas. Russia uses elliptical satellites where the geostationary satellites can't reach.
B( T2/R3 = constant )
As far as is known: -- Neither Mercury nor Venus has any natural satellites. -- Earth has one -- Mars has two