It means a satellite orbiting close to the surface of the earth has a time period of revolution, about 84.6 Minutes.
What is satellite?
- A satellite is a body that orbits a planet, star, or moon. For instance, the fact that Earth orbits the sun makes it a satellite. 
- The moon is a satellite as well because it revolves around Earth. 
- The term "satellite" typically refers to a device that is launched into space and orbits the Earth or another celestial body.
- Some examples of natural satellites are the Earth and the moon. 
- The Earth is orbited by thousands of artificial or human-made satellites. 
- Some people capture images of the world that aid in weather forecasting and storm tracking. 
- Some photograph distant galaxies, the sun, black holes, dark matter, or other planets. 
- These images aid in the scientific understanding of the solar system and the cosmos.
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