mirrored file at http://SaturnianCosmology.Org/ 
For complete access to all the files of this collection
	see http://SaturnianCosmology.org/search.php 
==========================================================
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Earth Fact Sheet
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[1][Global view of Earth] 
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Bulk parameters

Mass (10^24 kg)                 5.9736
Volume (10^10 km^3)             108.321
Equatorial radius (km)          6378.1
Polar radius (km)               6356.8
Volumetric mean radius (km)     6371.0
Core radius (km)                3485
Ellipticity (Flattening)        0.00335
Mean density (kg/m^3)            5515
Surface gravity (m/s^2)          9.798
Surface acceleration (m/s^2)     9.780
Escape velocity (km/s)         11.186
GM (x 10^6 km^3/s^2)               0.3986
Bond albedo                     0.306
Visual geometric albedo         0.367
Visual magnitude V(1,0)        -3.86
Solar irradiance (W/m^2)         1367.6
Black-body temperature (K)       254.3
Topographic range (km)            20
Moment of inertia (I/MR^2)       0.3308
J[2] (x 10^-6)                    1082.63
Number of natural satellites       1
Planetary ring system             No
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Orbital parameters

Semimajor axis (10^6 km)         149.60
Sidereal orbit period (days)    365.256
Tropical orbit period (days)    365.242
Perihelion (10^6 km)             147.09
Aphelion (10^6 km)               152.10
Mean orbital velocity (km/s)     29.78
Max. orbital velocity (km/s)     30.29
Min. orbital velocity (km/s)     29.29
Orbit inclination (deg)           0.000
Orbit eccentricity                0.0167
Sidereal rotation period (hrs)   23.9345
Length of day (hrs)              24.0000
Obliquity to orbit (deg)         23.45
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Earth Mean Orbital Elements (J2000)

Semimajor axis (AU)                  1.00000011
Orbital eccentricity                 0.01671022
Orbital inclination (deg)            0.00005
Longitude of ascending node (deg)  -11.26064
Longitude of perihelion (deg)      102.94719
Mean Longitude (deg)               100.46435
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North Pole of Rotation

Right Ascension:  0.00 - 0.641T
Declination    : 90.00 - 0.557T
Reference Date : 12:00 UT 1 Jan 2000 (JD 2451545.0)
T = Julian centuries from reference date
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Terrestrial Magnetosphere

Dipole field strength: 0.3076 gauss-Re^3
Latitude/Longitude of dipole N: 78.6 degrees N/70.1 degrees W
Dipole offset (planet center to dipole center) distance: 0.0725 Re
Latitude/Longitude of offset vector: 18.3 degrees N/147.8 degrees E

Note: Re denotes Earth radii, 6,378 km
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Terrestrial Atmosphere

Surface pressure: 1014 mb
Surface density: 1.217 kg/m^3 Scale height: 8.5 km
Total mass of atmosphere:  5.1 x 10^18 kg
Total mass of hydrosphere:  1.4 x 10^21 kg
Average temperature:  288 K (15 C)
Diurnal temperature range: 283 K to 293 K (10 to 20 C)
Wind speeds: 0 to 100 m/s
Mean molecular weight: 28.97 g/mole
Atmospheric composition (by volume, dry air):
Major      : 78.084% Nitrogen (N[2]), 20.946% Oxygen (O[2]),
Minor (ppm): Argon (Ar) - 9340; Carbon Dioxide (CO[2]) - 350
Neon (Ne) - 18.18; Helium (He) - 5.24; CH[4] - 1.7
Krypton (Kr) - 1.14; Hydrogen (H[2]) - 0.55
Water is highly variable, typically makes up about 1%
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The Moon

For information on the Moon, see the [2]Moon Fact Sheet
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If no sub- or superscripts appear on this page - for example, if the
"Mass" is given in units of "(1024 kg)" - you may want to check the
[3]notes on the sub- and superscripts.

[4]bullet Notes on the factsheets - definitions of parameters, units,
notes on sub- and superscripts, etc.

[5]bullet Planetary Fact Table - metric units
[6]bullet Planetary Fact Table - U.S. units
[7]bullet Planetary Fact Table - Earth ratio
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[8]bullet Earth Page
[9]bullet Directory to other Planetary Fact Sheets
[10]bullet NSSDC Planetary Home Page
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[NASA Logo]

Author/Curator:
Dr. David R. Williams, [11]dwilliam at nssdc.gsfc.nasa.gov
NSSDC, Mail Code 633
NASA Goddard Space Flight Center
Greenbelt, MD 20771
+1-301-286-1258
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NASA Official: Ed Grayzeck, edwin.j.grayzeck at nasa.gov
Last Updated: 27 October 2003, DRW

References

1. http://nssdc.gsfc.nasa.gov/planetary/image/earthfact_bg.gif
2. http://nssdc.gsfc.nasa.gov/planetary/factsheet/moonfact.html
3. http://nssdc.gsfc.nasa.gov/planetary/factsheet/fact_notes.html
4. http://nssdc.gsfc.nasa.gov/planetary/factsheet/fact_notes.html
5. http://nssdc.gsfc.nasa.gov/planetary/factsheet/index.html
6. http://nssdc.gsfc.nasa.gov/planetary/factsheet/planet_table_british.html
7. http://nssdc.gsfc.nasa.gov/planetary/factsheet/planet_table_ratio.html
8. http://nssdc.gsfc.nasa.gov/planetary/planets/earthpage.html
9. http://nssdc.gsfc.nasa.gov/planetary/planetfact.html
10. http://nssdc.gsfc.nasa.gov/planetary/planetary_home.html
11. mailto:dwilliam at nssdc.gsfc.nasa.gov