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The angle measured at the center of an illuminated body between the light source and the observer.
Asteroids II. 1989. R.P. Binzel, T. Gehrels, and M.S. Matthews, Eds., University of Arizona Press, Tucson.
The list of defined terms to the left is by no means exhaustive with
respect to the general subject of solar system dynamics.
The terms listed are thought to be those more commonly used on our site
and thus appropriate for inclusion on this page.