The translator's original copy and a coeval transcript of it are still extant in the Bodleian library (Bodl.
The problem of determining an orbit may be regarded as coeval with Hipparchus, who, it is supposed, found the moving positions of the apogee and perigee of the moon's orbit.
Economic motives, again, are as varied as the forms of competition, and their development is coeval with that of human society.
Remains of spiders from the Baltic amber beds of Oligocene age and from nearly coeval fluviatile or lacustrine deposits of North America belong to forms identical with or closely related to existing genera, thus proving the great antiquity of our present spider fauna.
Other traditions trace their origin to the Himyaritic chiefs Sanhaj and Samamah, said to have been coeval with a King Afrikus, who is supposed to have conquered Africa about 400.