Cosmographic Values Index    © 1997 by James Q. Jacobs

A set of cosmographic values with code based on International Astronomic Union constants for Jan. 1, 2000. For data based on the Geodetic Reference System 1980 see the Geodesy Page, Figure of the Earth section.

More constants are available with the complete AeGeo code.
Most recent values and codes are found in the Epoch Calc applet, an Excel file.

CONSTANT NUMERIC VALUE CODE*
Earth, Radius, Equatorial IAU 1979

3963.19245606 mi.
6,378,140 m

er

Earth, Circumference, Equatorial

24,901.4726094 mi.
40,075,035.5351 m

ce

Earth, Circumference, Mean

24,873.492365 mi.
40,030,005.6967 m

crm

Earth, Arc Degree, Mean

69.0933962964 mi.
111,1950.42769 m

am

Earth, Radius, Mean

3958.73926185 mi.
6,370,973.27862 m

ra

Earth, Radius, Polar

3949.90462476 mi.
6,356,755.28816 m

rp

Flattening, axis ratio

0.996647186822

fl

Flattening inverse

298.257

fi

Flattening of the Earth

0.0033528131779

fe

Inclination, Lunar Orbit, Mean

5.1453964°

il

Wobble, Lunar Orbit Inclination

± 0.0025°

wl

Moon, Distance, Mean

384,399,070 m

md

Lunar Orbit Eccentricity

0.054900489

le

Moon, Radius, Mean

1,738,000 m

mrm

Obliquity of the Ecliptic

23.439291111°

ob

Solar distance

149,597,870,000 m

au

Geographical Mile

1,855.32571922 m

mg

MODULES

in degrees

CODE

Lunar Motion per Mean Rotation

13.1403824445°

r27

Mean Daily Lunar Motion

13.1763582244°

c27

Solar Orbit per Day

0.985609119791°

so

Solar Orbit per Sidereal Rotation

0.982918083604°

si

Solar Orbit per Nodal Period

26.8206129544°

s22

Solar Orbit per Sidereal Orbit

26.9284788014°

s27

Solar Orbit per Anomalistic Period
27.15801232210°

s25

Solar Orbit per Synodic Period

29.1056177173°

s29

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* The code was originally written for compatibility with an HP48 SX.
To upload the code to your HP see the:
COSMOGRAPHY DATA PROGRAMMING FILE

FOR MORE ASTRONOMIC AND GEODETIC DATA CHECK OUT THE:

Astronomical Constants Index - - Astronomy Formulas Pages - - Geodesy Page
Did ancient astronomers survey the Earth? - - Read the Archaeogeodesy Pages


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©1997 by James Q. Jacobs.  All rights reserved.
Your comments, etc. are appreciated: Contact.
Published Oct. 31, 1997. Cite as: http://www.jqjacobs.net/astro/cosmo.html

Most recent values and codes are found in the Epoch Calc applet, an Excel file.