<P> The apparent magnitude ( m ) of a celestial object is a number that is a measure of its brightness as seen by an observer on Earth . The brighter an object appears , the lower its magnitude value ( i.e. inverse relation ) . The Sun , at apparent magnitude of − 27 , is the brightest object in the sky . It is adjusted to the value it would have in the absence of the atmosphere . Furthermore , the magnitude scale is logarithmic ; a difference of one in magnitude corresponds to a change in brightness by a factor of √ 100 , or about 2.512 . </P>
<P> The apparent magnitude ( m ) of a celestial object is a number that is a measure of its brightness as seen by an observer on Earth . The brighter an object appears , the lower its magnitude value ( i.e. inverse relation ) . The Sun , at apparent magnitude of − 27 , is the brightest object in the sky . It is adjusted to the value it would have in the absence of the atmosphere . Furthermore , the magnitude scale is logarithmic ; a difference of one in magnitude corresponds to a change in brightness by a factor of √ 100 , or about 2.512 . </P>
the apparent visual magnitude of a star is a measure of the star 's
the apparent visual magnitude of a star is a measure of the star 's
brightness as seen by an observer on Earth
brightness as seen by an observer on Earth