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Chapter 2

AS101 Chapter Notes - Chapter 2: Orbiting Body, Orbit, Lunar Phase


Department
Astronomy
Course Code
AS101
Professor
Arthur Read
Chapter
2

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AS- Chapter .: The Stars
Constellations
Constellations
o Stellar patterns identified by name, usually of mythological gods, people, animals, or
objects; Now, constellations represent the region of the sky containing that star pattern
Asterisms
o A named grouping of stars that is not one of the recognized constellations
The Brightness of Stars
Magnitude Scale
o The astronomical brightness scale; the larger the number, the fainter the star
Apparent Visual Magnitude
o A measure of the brightness of a star as seen by human eyes on Earth
Flux
o A measure of the flow of energy out of a surface, usually applied to light
AS- Chapter .: The Sky and Its
Motions
The Celestial Sphere
Celestial Sphere
o An imaginary sphere of a very large radius surrounding Earth to which planets, stars,
Sun, and Moon seem to be attached
Eath’s Rotatio
o The sky appears to rotate westward around the Earth each day, but that is a
consequence of the eastward rotation of the Earth. This produces day and night
People’s Vie of the “k
o What people can see in the sky depends on where they are in the Earth, certain
constellations can only be seen in certain places
Arc Measurements
o Astronomers measure distances across the sky as angles expressed in units of degrees
and subdivisions called arc minutes and arc seconds
Precession
Precession
o The slo hage i oietatio of Eath’s ais of otatio, oe le takes eal 26,000
years
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