Perigee
Perigee is the point in the orbit of a celestial body (such as a planet, moon, or satellite) that is nearest to the center of the body it orbits. In the context of space and astronautical engineering, perigee is an important concept as it determines the closest distance a spacecraft or satellite can be to the Earth. This distance affects the velocity and trajectory of the spacecraft, and can be used to optimize fuel consumption and mission objectives. For example, a spacecraft in a low Earth orbit with a perigee of 200 km will experience more atmospheric drag than a spacecraft in a higher orbit with a perigee of 500 km. Therefore, perigee is an important parameter to consider when designing and planning space missions.
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