binary system

Two centuries ago the distinguished philosopher and mathematician, Leibnitz, proposed a binary system of numeration.

It is not known that they constitute a binary system, because no certain evidence of motion has been obtained.

The close pair is a binary system with a long period of revolution, estimated at about two hundred years.

The star 70 Ophiuchi (fig. 3) may be regarded as typical of a binary system.

It is virtually certain that RR Centauri is a case of an eclipsing binary system, and that the two stars are close together.