Table 3-1 Relationship between Sidereal Period and a Planet’s Orbit

	Synodic and Sidereal Periods of the Planets		Average Distances of the Planets from the Sun
Planet	Synodic period	Sidereal period	Copernican value (AU*)	Modern value (AU)
Mercury	116 days	88 days	0.38	0.39
Venus	584 days	225 days	0.72	0.72
Earth		1.0 year	1	1
Mars	780 days	1.9 years	1.52	1.52
Jupiter	399 days	11.9 years	5.22	5.2
Saturn	378 days	29.5 years	9.07	9.55
Uranus	370 days	84.1 years		19.19
Neptune	368 days	164.9 years		30.07
^*1 AU = 1 astronomical unit = average distance from Earth to the Sun