FACTOID # 70: Contrary to the popular rhyme, the rain falls mainly on Guinea.
 
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Encyclopedia > Magnitude (astronomy)
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  Results from FactBites:
 
Richter magnitude scale - Wikipedia, the free encyclopedia (688 words)
His inspiration for the technique was the stellar magnitude scale used in astronomy to describe the brightness of stars and other celestial objects.
Richter arbitrarily chose a magnitude 0 event to be an earthquake that would show a maximum combined horizontal displacement of 1 micrometre on a seismogram recorded using a Wood-Anderson torsion seismometer 100 km from the earthquake epicenter.
By the beginning of the 21st century, most seismologists considered the traditional magnitude scales to be largely obsolete, being replaced by a more physically meaningful measurement called the seismic moment which is more directly relatable to the physical parameters, such as the dimension of the earthquake rupture, and the energy released from the earthquake.
Star (astronomy) - MSN Encarta (1001 words)
The brightest stars are classified as 1st magnitude, 2nd-magnitude stars are about 2.5 times less bright, while stars just visible to the naked eye on a clear night are 6th magnitude.
Apparent magnitude is the brightness of a star as viewed from Earth, and the absolute magnitude of a star is its actual brightness as viewed from a set distance away from the star.
The difference between these two types of magnitude helps astronomers distinguish between stars that appear bright only because they are relatively close to Earth and stars that appear bright because they are intrinsically bright or highly luminous.
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