This chart shows the differences between Mercury and Mercury. To change the planets/moons being compared, change one or more of the form fields at the bottom and click Refresh.

	Mercury	Mercury
Discovered By	Known by the Ancients	Known by the Ancients
Date of Discovery	Unknown	Unknown
Average Orbit Distance	57,909,227 km	57,909,227 km
Perihelion (closest)	46,001,009 km	46,001,009 km
Aphelion (farthest)	69,817,445 km	69,817,445 km
Equatorial Radius	2,439.7 km	2,439.7 km
Equatorial Circumference	15,329.1 km	15,329.1 km
Volume	60,827,208,742 km3	60,827,208,742 km3
Mass	330,104,000,000,000,000,000,000 kg	330,104,000,000,000,000,000,000 kg
Density	5.427 g/cm3	5.427 g/cm3
Surface Area	74,797,000 km2	74,797,000 km2
Equatorial Surface Gravity	3.7 m/s2	3.7 m/s2
Escape Velocity	15,300 km/h	15,300 km/h
Rotation Period (Length of Day)	58.646 sidereal days	58.646 sidereal days
Orbit Period (Length of Year)	0.2408467 sidereal years	0.2408467 sidereal years
Mean Orbit Velocity	170,503 km/h	170,503 km/h
Orbit Eccentricity	0.20563593	0.20563593
Orbit Inclination to Ecliptic	7.0 degrees	7.0 degrees
Equatorial Inclination to Orbit	0 degrees	0 degrees
Orbit Circumference	359,976,856 km	359,976,856 km
Minimum/Maximum Surface Temperature	-173/427 °C	-173/427 °C