The "Sky and telescope" guide to the heavens

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Modern pocket calculators allow the following formula to be solved quickly and easily: cos/ = sin 6t sin alt;J| + cos dj cos ... Since each half hour equals 15Ad, a tail pointed to 4:30 has a position angle of 225Ad. ... But when they extend several degrees or more and the earth does not lie near the cometa#39;s orbital plane, the dust tail will be noticeably curved. ... A gas tail is almost always a small fraction of this width, but a dust tail usually begins as a prolongation of the outer edges of the coma.

Title:The "Sky and telescope" guide to the heavens
Author: Leif J. Robinson, Charles Scovil
Publisher: - 1980

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