In astronomy, magnitude is measure of the brightness of an object, usually in a defined passband. An imprecise but systematic determination of the magnitude...

observer. The word magnitude in astronomy, unless stated otherwise, usually refers to a celestial object's apparent magnitude. The magnitude scale dates to...

instrument. Magnitude (astronomy), a measure of brightness and brightness differences used in astronomy Magnitude of eclipse or geometric magnitude, the size...

naked eye, or listed separately if they do not. As with all magnitude systems in astronomy, the scale is logarithmic and inverted i.e. lower/more negative...

In astronomy, absolute magnitude (M) is a measure of the luminosity of a celestial object on an inverse logarithmic astronomical magnitude scale. An object's...

in numerical value. Apparent magnitude Absolute magnitude Araucaria Project Magnitude (astronomy) Photometry (astronomy) Surface brightness Miles, R....

Glossary of astronomy List of brightest stars List of most luminous stars Orders of magnitude (power) Solar luminosity "Luminosity | astronomy". Encyclopedia...

called "of the sixth magnitude". During a series of lectures given in 1736 at the University of Oxford, its then Professor of Astronomy explainedː The fixed...

calculate brightness in terms of its total magnitude, energy output or luminosity per unit surface area. Astronomy was among the earliest applications of...

first-magnitude stars. The Southern Cross including the first-magnitude stars Acrux and Mimosa, west of the Carina Nebula (one of five first-magnitude deep-sky...