How is perihelion calculated?
1 Answer
Nov 30, 2015
Perihelion can be calculated if you know the eccentricity of the orbit and the Semi-major axis of the elliptical orbit.
Explanation:
Perihelion can be calculated if you know the eccentricity of the orbit and the Semi-major axis of the elliptical orbit.
Perihelion = a (1 - e)
Where,
a is the semi-major axis
e is the eccentricity
Consider the orbit of Earth around the Sun.
The eccentricity of Earth's orbit is about 0.0173 and the semi-major axis is 149 million km. In other words the semi-major axis is actually the average distance between Earth and the Sun.
SO,
Perihelion = 1.49 x
Perihelion = 146 million km
Also,
Aphelion = a (1 + e)
Aphelion = 1.49 x
Aphelion = 152 million km.