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39 Cards in this Set
- Front
- Back
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Diurnal Motion
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24 Hr. rotation of earth around axis
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how long is the rotation of earth around axis?
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365 Days (1 year)
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Solar day
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24 hr. of rotation (sun)
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Sidereal Day
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23 Hr. 56 Min. rotation (stars
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Precession
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wobble of earth's axis
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Retrograde
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Apparent motion of planets backing up
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Culmination
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highest point in the sky
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Ecliptic Definitions
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Path of sun in the sky/ Orbital plane on earth
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Astronomical unit
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93 Million miles semi/major axis of earth
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Circumpolar stars
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stars that never set in our latitude
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Geocentric Theory
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Theory that earth his in center of the (solar) system
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Heliocentric Theory
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theory that sun is in center of the (solar) system.
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Best position to observe inferior planets
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Greatest elongation
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Best position to observe superior planets.
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Opposition
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Aristotle
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figured out the earth is round
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Aristarchus
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discovered The Heliocentric Theory
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Erastosthenes
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size of the earth
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Hipparchus
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Brightness of stars
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Ptolemy
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wrote Almagest summary
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Stellar Paralax
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No telescopes to prove stellar paralax, crude instruments.
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Copernicus
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established the heliocentric Theory
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Tycho Brahe
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Greatest astronomical observer without using a telescope
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Galileo
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first to look through a telescope
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Kepler
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planetary motions
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Newton
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Discovered Gravity
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Kepler's law
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P to the 2nd power= A to the 3rd power
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Constant angular momentum
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Farther the planets the slower. The closer the planets, the faster.
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P =
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period of planet in years
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A =
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distance in astronomical units
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Long wavelength =
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cool energy
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Short wavelength =
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hot energy
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Wein's Law =
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temperature = color
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Three types of telescopes, What are they?
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Refractor, Newtonian, and SCT
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Refractor
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Objective: lens
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Newtonian
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Objective: Mirror
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SCT
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Objective: Primary mirror (Gathers Light)
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Light gathering power (LPG)
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the bigger, the better
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Telescopes and wavelengths: Orbital vs. Land based
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All wavelengths are visible in space
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Magnification
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the least powerful
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