Sunday, December 14, 2008

J

Jovian planet

One of the four large, relatively low density planets: Jupiter, Saturn, Uranus, and Neptune.

 

Julian calendar

A solar calendar introduced by Julius Caesar.

 

Julian day calendar

A calendar based on the system of the continuous numbering of the days beginning with January 1, 4713 B.C.

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References:

1] Pananides, Nicholas A. & Arny, Thomas, Introductory Astronomy: Second Edition, 1979, Addison-Wesley Publishing Company.

[2] The Astronomical Almanac Online 2009.

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