- A circle is a shape consisting of all points in a plane that are at a given distance from a given point, the centre. The distance between any point of the circle and the centre is called the radius.
- Star Tales - Apus (ianridpath.com)
One of the dozen new constellations introduced at the end of the 16th century from observations of the southern sky by the Dutch navigators Pieter Dirkszoon Keyser and Frederick de Houtman. Apus represents a fabulous bird of paradise, as found in New Guinea, but it is a disappointing tribute to such an exotic creature, its brightest stars being of only 4th magnitude.
