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en.wikipedia.org/wiki/Magnitude_(astronomy)

In astronomy, magnitude is a logarithmic measure of the brightness of an object, measured in a ... The brighter an object appears, the lower the value of its magnitude, with the brightest objects reaching negative values. ... classified stars by their apparent brightness, which they saw as size (magnitude means "bigness, size").

en.wikipedia.org/wiki/Apparent_magnitude

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 ... This rather crude scale for the brightness of stars was popularized by Ptolemy in his Almagest, and is generally  ...

www.space.com/21640-star-luminosity-and-magnitude.html

Jun 19, 2013 ... The brightness of a star is measured several ways: how it appears from ... terms of apparent magnitude (how bright the star appears from Earth) and ... them by how bright they appear — the brightest stars were 'magnitude 1', ...

curious.astro.cornell.edu/about-us/82-the-universe/stars-and-star-clusters/measuring-the-stars/391-how-do-astronomers-measure-the-brightness-of-stars-intermediate

Jun 27, 2015 ... When you look at the night sky, you see several stars, some of ... For instance, from Saturn, the Sun will not appear like the brilliant Sun of the Earth, ... So, to measure the brightness (the scientific term is luminosity) of .... Clusters Magnitude Galactic Plane Radio Astronomy Dwarf Planets Interstellar Medium ...

www.flashcardmachine.com/characterizing-stars.html

Nov 20, 2008 ... Brightness of stars without regard to their distances;a measure of the ... The apparent magnitude that a star would have if it were 10 parsecs from Earth ... - hydrogen makes up about ¾ of a stars mass, but they don't always .... -on spectrum of a binary star, strong absorption lines of say, helium, may appear ...

www.astronomynotes.com/starprop/s4.htm

Nov 2, 2010 ... The brightness of stars are specified with the magnitude system. ... They established that a difference of 5 magnitudes corresponds to a ... The apparent brightness of a star observed from the Earth is called the apparent magnitude. ... If you measure the apparent brightness, temperature, and distance of a ...

www.ifa.hawaii.edu/users/lin/ast110-6/ast110-21.ppt

The brightness of the a star as it appears to our eyes (or detectors). It depends on both the luminosity AND distance between the star and the Earth. ... Apparent magnitude describes the relative brightness of objects as they appears in sky. ... We can measure the temperature of the stars or any object by studying the shape of ...

www.e-education.psu.edu/astro801/content/l4_p4.html

Stars have a wide range of apparent brightness measured here on Earth. The variation in their ... Why do light sources appear fainter as a function of distance?

www.e-education.psu.edu/astro801/content/l4_p5.html

If you notice, the magnitude system is therefore backwards–the brighter a star is, ... That is, the apparent magnitude of a star is its magnitude measured on Earth. ... magnitudes to classify stars based on how they would appear if they were all at ...

www.krysstal.com/thestars.html

In astronomy, brightness is measured by the apparent magnitude scale. This is a .... The apparent magnitude of a star is how bright it appears from the Earth. It takes ... As they heat up they glow orange, then yellow, then white and finally blue.