Orbital Period

The orbital period is the time required by a celestial body to complete a full 360° circle, relative to a point of reference.

The point of reference can, for example, be

• the apparent position of the Sun (synodic period)
• the vernal equinox (tropical period)
• the nodes of an orbit (draconitic period)
• the pericenter of an orbit (anomalistic period)
• the fixed star background (sidereal period)

The anomalistic periods of the important bodies in our solar system are

m	T	notes
Moon	27.55 days	sidereal: 27.32 days. synodic: 29.53 days
Mercury	87.97 days
Venus	224.70 days
Earth	365.256 days	tropical: 365.242 days
Mars	686.98 days	1 year 322 days
Jupiter	11.869 years	11 years 317 days or 4334 days
Saturn	29.628 years	29 years 229 days
Uranus	84.665 years	84 years 243 days
Neptune	165.49 years	165 years 5-6 Monate
Pluto	247.7 years	uncertain. between 247.5 and 248 years

web links

Wikipedia, orbital period