COLLECTED BY
Organization:
Archive Team
Formed in 2009, the Archive Team (not to be confused with the archive.org Archive-It Team) is a rogue archivist collective dedicated to saving copies of rapidly dying or deleted websites for the sake of history and digital heritage. The group is 100% composed of volunteers and interested parties, and has expanded into a large amount of related projects for saving online and digital history.
History is littered with hundreds of conflicts over the future of a community, group, location or business that were "resolved" when one of the parties stepped ahead and destroyed what was there. With the original point of contention destroyed, the debates would fall to the wayside. Archive Team believes that by duplicated condemned data, the conversation and debate can continue, as well as the richness and insight gained by keeping the materials. Our projects have ranged in size from a single volunteer downloading the data to a small-but-critical site, to over 100 volunteers stepping forward to acquire terabytes of user-created data to save for future generations.
The main site for Archive Team is at archiveteam.org and contains up to the date information on various projects, manifestos, plans and walkthroughs.
This collection contains the output of many Archive Team projects, both ongoing and completed. Thanks to the generous providing of disk space by the Internet Archive, multi-terabyte datasets can be made available, as well as in use by the Wayback Machine, providing a path back to lost websites and work.
Our collection has grown to the point of having sub-collections for the type of data we acquire. If you are seeking to browse the contents of these collections, the Wayback Machine is the best first stop. Otherwise, you are free to dig into the stacks to see what you may find.
The Archive Team Panic Downloads are full pulldowns of currently extant websites, meant to serve as emergency backups for needed sites that are in danger of closing, or which will be missed dearly if suddenly lost due to hard drive crashes or server failures.
ArchiveBot is an IRC bot designed to automate the archival of smaller websites (e.g. up to a few hundred thousand URLs). You give it a URL to start at, and it grabs all content under that URL, records it in a WARC, and then uploads that WARC to ArchiveTeam servers for eventual injection into the Internet Archive (or other archive sites).
To use ArchiveBot, drop by #archivebot on EFNet. To interact with ArchiveBot, you issue commands by typing it into the channel. Note you will need channel operator permissions in order to issue archiving jobs. The dashboard shows the sites being downloaded currently.
There is a dashboard running for the archivebot process at http://www.archivebot.com.
ArchiveBot's source code can be found at https://github.com/ArchiveTeam/ArchiveBot.
The Wayback Machine - http://web.archive.org/web/20250814041201/https://nssdc.gsfc.nasa.gov/planetary/factsheet/earthfact.html
Earth Fact Sheet
Bulk parameters
Mass (1024 kg) 5.9722 Volume (1010 km3) 108.321 Equatorial radius (km) 6378.137 Polar radius (km) 6356.752 Volumetric mean radius (km) 6371.000 Core radius (km) 3485 Ellipticity (Flattening) 0.003353 Mean density (kg/m3) 5513 Surface gravity (mean) (m/s2) 9.820 Surface acceleration (eq) (m/s2) 9.780 Surface acceleration (pole) (m/s2) 9.832 Escape velocity (km/s) 11.186 GM (x 106 km3/s2) 0.39860 Bond albedo 0.294 Geometric albedo 0.434 V-band magnitude V(1,0) -3.99 Solar irradiance (W/m2) 1361.0 Black-body temperature (K) 254.0 Topographic range (km) 20.4 Moment of inertia (I/MR2) 0.3308 J2 (x 10-6) 1082.63 Number of natural satellites 1 Planetary ring system No
Orbital parameters
Semimajor axis (106 km) 149.598
Sidereal orbit period (days) 365.256
Tropical orbit period (days) 365.242
Perihelion (106 km) 147.095
Aphelion (106 km) 152.100
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) 23.44
Inclination of equator (deg) 23.44
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
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
Terrestrial Magnetosphere
Model GSFC-1283 Dipole field strength: 0.306 Gauss-Re3 Dipole offset: 0.076 Re Surface (1 Re) field strength: 0.24 - 0.66 Gauss Geomagnetic Poles - Model WMM2020 Geocentric Dipole: 80.65 N, 72.68 W Magnetic North Pole: 86.50 N, 164.04 E
Re denotes Earth model radius, here defined to be 6,378 km
Terrestrial Atmosphere
Surface pressure: 1014 mb
Surface density: 1.217 kg/m3
Scale height: 8.5 km
Total mass of atmosphere: 5.1 x 1018 kg
Total mass of hydrosphere: 1.4 x 1021 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
Atmospheric composition (by volume, dry air):
Major : 78.08% Nitrogen (N2), 20.95% Oxygen (O2),
Minor (ppm): Argon (Ar) - 9340; Carbon Dioxide (CO2) - 420
Neon (Ne) - 18.18; Helium (He) - 5.24; CH4 - 1.94
Krypton (Kr) - 1.14; Hydrogen (H2) - 0.55
Numbers do not add up to exactly 100% due to roundoff and uncertainty
Water is highly variable, typically makes up about 1%
Note that the acceleration values given are for the equator and pole.
The standard acceleration of gravity for Earth is defined (CODATA 2018) as 9.80665 m/s2 (exact).
The Moon
For information on the Moon, see the Moon Fact Sheet
Notes on the factsheets
- definitions of parameters, units, notes on sub- and superscripts, etc.
Planetary Fact Table
- metric units
Planetary Fact Table
- U.S. units
Planetary Fact Table
- Earth ratio
Earth Page
Directory to other Planetary Fact Sheets
Author/Curator:Dr. David R. Williams, dave.williams@nasa.gov
NSSDCA, Mail Code 690.1
NASA Goddard Space Flight Center
Greenbelt, MD 20771
+1-301-286-1258