The perimeter of the earth's orbit
2020-04-18 - Kiss J Gabor
Earth-drill
1. The Earth’s orbit
Earth orbits the Sun at an average distance of 149,60 million km.
One full orbit takes one tropical year (solar year) = 365,2421897 days.
Earth’s orbital speed averages 29.78 km/s.
Earth’s orbit is an ellipse with the Earth-Sun barycenter as one focus and a current eccentricity of 0.0167086.
| aphelion | perihelion | major semi-axis | eccentricity | minor semi-axis | speed at aphelion | speed at perihelion |
|---|---|---|---|---|---|---|
| b | e | b | ||||
| 152 095 295 km | 147 091 144 km | 149,598,261 km | 0.0167086 | 149,577,377 km | 29.29 km/s | 30.29 km/s |
| b² = a²(1 - e²) |
The perimeter is
a. Take average_speed × solat_year
p = 29,78 × 365,2421897×24×60×60 = 9,3976523216 × 108 km .
b. As circumference of an ellipse
p ≈ π × ( a + b ) = 3,141592×(149598261+149577377) = 9,3988798746 × 108 km .
Data source: NASA Earth Fact Sheet
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