Landsat orbits in a sun-synchronous polar orbit, declined at 99 degrees (so 9 degrees from 90). It makes about 14 passes over the Earth every day given its orbital parameters but does not pass over the same spot more than once in 16 days.
So essentially, it passes over the Earth roughly north-south many times a day, just about going over the poles and back up again.
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A propagation delay is the amount of time it takes radio waves to travel from the surface of the Earth to the satellite and then back down to the Earth. The calculation of the delay is based upon the altitude and position of the satellite systems.
I believe that is around 90 minutes or about an hour and a half. I'm pretty sure of that.
A satellite- meter takes radar images of faults.
It takes 365 days for Earth to orbit the sun. Mercury takes 88 days, Venus takes 224 days, Uranus takes about 84 years, and Mars takes 664 days. Neptune takes 164 years and 9 months to orbit the sun. The planet Jupiter takes almost 12 years and Saturn takes 29 and a half years.