aberration of starlight
During a year the apparent position of a star describes a curve around its true position. This curve is an ellipse except when the star lies on the ecliptic (when it is a line along which the star appears to move backwards and forwards) or when it is in the pole of the ecliptic (when it is a circle). As aberration depends upon the ratio between the velocity of light and the velocity of the Earth, the determination of this ‘constant of aberration’ provides a method of calculating an approximate value for one of these velocities if the other is known.
© RM 2012. Helicon Publishing is division of RM.
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