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Stellar Parallax diagram

The apparent motion of a near by star is a small ellipse in the sky relative to background stars over the period of a year.

The angle representing major axis radius of the elliptical path is the parallax angle.

The minor axis radius angle is simply related to the direction of the star relative to the earth's orbital axis. Stars near the north and south poles will make perfect circles, while stars near the ecliptic will make flat ellipses.

Credit:

• This diagram was made by Tom Ruen for Stellar Parallax article.

This work has been released into the public domain by its author, Tomruen. This applies worldwide. In some countries this may not be legally possible; if so: Tomruen grants anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.

taken from en:Image:Stellarparallax2.png
history of the file on en:
01:15, 21 May 2004 . . Tomruen . . 391x778 (19069 bytes) (Stellar Parallax diagram)