As the train is travelling at a very high speed (assuming this is near light speed) events in one frame of reference that seem simultaneous may not appear simultaneous in another frame of reference. Observer B (on the platform) will observe that the events are simultaneous, as the light from the...
A LEO satellite has an altitude of 300-1000km and an orbital period of approximately 90 minutes. On the other hand, a geostationary satellite has an altitude of 36,000km and an orbital period of 23hr 56min, which matches the earth's rotation. Both types of satellites require an extremely high...