The apparent magnitude of a celestial object is a number that is a measure of its brightness as seen by an observer on Earth.
Cepheus is a constellation in the northern sky, which is named after Cepheus (a King in the Greek mythology).
This is the list of notable stars in the constellation Cepheus, sorted by decreasing brightness.
In astronomy, the main sequence is a continuous and distinctive band of stars that appear on plots of stellar color versus brightness.
Seth Carlo Chandler, Jr. (September 16, 1846 – December 31, 1913) was an American astronomer.
A variable star is a star whose brightness as seen from Earth (its apparent magnitude) fluctuates.