= Earth Fact Sheet by National Aeronautics and Space Administration
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{tag=Work by National Aeronautics and Space Administration}
https://nssdc.gsfc.nasa.gov/planetary/factsheet/earthfact.html[Official planetary fact sheet]
The bulk-parameters table gives the terrestrial <standard gravitational parameter> and volumetric mean <radius> $6371\,\mathrm{km}$. The orbital-parameters table distinguishes the <sidereal day>, $23.9345\,\mathrm{hours}$, from the $24$-hour solar day. Use the problem's own radius when it supplies one.
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