Magnitude
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Magnitude may refer to:
- Magnitude (mathematics), the relative size of a mathematical object
- Order of magnitude, the class of scale having a fixed value ratio to the preceding class
- A Euclidean vector is defined by both its magnitude and its direction
- A scalar variable is defined only by its magnitude
- Apparent magnitude, the apparent brightness of a celestial object as observed from earth
- Absolute magnitude, the brightness of a celestial object corrected to a standard luminosity distance
- Photographic magnitude, the brightness of a celestial object corrected for photographic sensitivity, symbol mpg
- Magnitude of eclipse, the ratio between the apparent angular diameters of the Moon and the Sun during an eclipse
- Richter magnitude scale, a measure of the energy of an earthquake
- Moment magnitude scale, an alternative to the Richter scale for measuring earthquakes
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