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Data

Table of Contents

1. Solar System Data

1.1. Earth

Constant Value Source
Earth's equatorial radius 6 378 136.6(1) m [1]
Mean Solar Day 86400s [1]
Orbital Period ("sidereal year") 365.256 363 004 days [1]
Mean equatorial gravity ("g") 9.780 327 8 (10) m/s2 [1]
Earth Mass 5.9724×1024 kg [2]
Semimajor axis 149.596×106 km [2]
Perihelion 147.092×106 km [2]
Aphelion 152.099×106 km [2]
Mean orbital velocity 29.78 km/s [2]
Max. orbital velocity 30.29 km/s [2]
Min. orbital velocity 29.29 km/s [2]
Obliquity ("axial tilt", ε) 23° 26′ 21.406″ (23.43655°) [3]

Notes:

  1. The orbital period is measured in units of mean solar day (86,400 seconds)
  2. The obliquity for the Earth varies over a 41,000 year period (Milankovitch cycles). It is taken at a standard time (at J2000.0 — 12:00 noon terrestrial time on January 1, 2000), with the understanding it varies slowly over time, as 84381.406000 arc seconds (or 23 degrees + 26 arcminutes + 21.406000 arc seconds exactly; or \(42.190703\pi/18^2 \approx 0.409092600601\) radians).

1.2. The Sun

Constant Value Source
Equatorial Solar Radius 695,700 km [4]
Luminosity 3.828×1026 W [4]
Temperature 5772 K [4]

2. Sources

2.1. Earth

Last Updated 2021-06-01 Tue 10:00.