National Aeronautics and Space Administration Logo
Follow this link to skip to the main content NASA Banner
Solar System Exploration
Earth's Moon: Facts & Figures
   Education   Missions   News   FAQ 
   Overview   Read More   Gallery   Facts & Figures 
Discovered By
Known by the Ancients
Date of Discovery
Orbit Size Around Earth (semi-major axis)
Metric: 384,400 km
English: 238,855 miles
Scientific Notation: 3.84400 x 105 km (0.00257 A.U.)
By Comparison: 0.00257 x Earth's Distance from the Sun
Average Distance from Earth
Metric: 384,400 km
English: 238,855 miles
Scientific Notation: 3.844 x 105 km (2.570 x 10-3 A.U.)
By Comparison: 0.00257 x Earth's distance from the Sun
Perigee (closest)
Metric: 363,104 km
English: 225,623 miles
Scientific Notation: 3.631 x 105 km (2.427 x 10-3 A.U.)
By Comparison: 0.00243 x Earth's distance from the Sun
Apogee (farthest)
Metric: 405,696 km
English: 252,088 miles
Scientific Notation: 4.057 x 105 km (2.712 x 10-3 A.U.)
By Comparison: 0.00271 x Earth's distance from the Sun
Sidereal Orbit Period (Length of Year)
0.074803559 Earth years
27.322 Earth days
Orbit Circumference
Metric: 2,413,402.16 km
English: 1,499,618.58 miles
Scientific Notation: 2.413 x 106 km
Average Orbit Velocity
Metric: 3,680.5 km/h
English: 2,287.0 mph
Scientific Notation: 1,022 m/s
By Comparison: 0.034 x Earth
Orbit Eccentricity
By Comparison: 3.315 x Earth
Orbit Inclination
5.16 degrees
By Comparison: Oscillates roughly 0.15 degrees in 173 days.
Equatorial Inclination to Orbit
6.68 degrees
Mean Radius
Metric: 1737.5 km
English: 1079.6 miles
Scientific Notation: 1.738 x 103 km
By Comparison: 0.2727 x Earth
Equatorial Circumference
Metric: 10,917.0 km
English: 6,783.5 miles
Scientific Notation: 1.0917 x 104 km
Metric: 21,971,669,064 km3
Scientific Notation: 2.197 x 1010 km3
By Comparison: 0.020 x Earth
Metric: 73,476,730,924,573,500,000,000 kg
Scientific Notation: 7.3477 x 1022 kg
By Comparison: 0.0123 x Earth
Metric: 3.344 g/cm3
By Comparison: 0.607 x Earth
Surface Area
Metric: 37,936,694.79 km2
English: 14,647,439.75 square miles
Scientific Notation: 3.793669 x 107 km2
By Comparison: 0.074 x Earth
Surface Gravity
Metric: 1.624 m/s2
English: 5.328 ft/s2
Scientific Notation: 1.624 m/s2
By Comparison: 0.166 x Earth
Escape Velocity
Metric: 8,552 km/h
English: 5,314 mph
Scientific Notation: 2,376 m/s
By Comparison: 0.212 x Earth
Sidereal Rotation Period (Length of Day)
27.322 Earth days
655.73 hours
By Comparison: Synchronous with Orbital Period
Minimum/Maximum Surface Temperature
Metric: -233/123 °C
English: -387/253 °F
Scientific Notation: 40/396 K

Additional Information:

Because of the gravitational pull of the sun, the extreme ranges of the Moon from the Earth are from 356,400 km to 406,700 km.
Awards and Recognition   Solar System Exploration Roadmap   Contact Us   Site Map   Print This Page
NASA Official: Kristen Erickson
Advisory: Dr. James Green, Director of Planetary Science
Outreach Manager: Alice Wessen
Curator/Editor: Phil Davis
Science Writers: Courtney O'Connor and Bill Dunford
Producer: Greg Baerg
Webmaster: David Martin
> NASA Science Mission Directorate
> Budgets, Strategic Plans and Accountability Reports
> Equal Employment Opportunity Data
   Posted Pursuant to the No Fear Act
> Information-Dissemination Policies and Inventories
> Freedom of Information Act
> Privacy Policy & Important Notices
> Inspector General Hotline
> Office of the Inspector General
> NASA Communications Policy
> NASA Advisory Council
> Open Government at NASA
Last Updated: 9 Jun 2015