Some stars appear to be brighter than others are and each star has its own magnitude of brightness The relationship between magnitude and brightness is a logarithmic one. The brighter the star is lower the number Polaris,the Pole Star (Alpha Ursae Minoris) has a magnitude of 2.1,Venus,the brightest of the planets has a magnitude about -3.5 and the Sun by comparison,which is so much brighter than any other celestial body, has a magnitude of -26.0