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28 Cards in this Set
- Front
- Back
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Quadrate |
Configuration in which a planet around the moon is 90 degrees from the sun as seen from the earth. |
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Conjunction |
Astronomical configuration in which the position of the planet and the sun lie in the same part of the sky as seen from the earth |
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Sidereal Period |
Time a celestial body takes to revolve around it's orbit relative to the stars moon = 27 1/3 days |
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Synodic Period |
time a celestial object takes to return to the same position in the sky moon 29 1/2 days |
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Superior Planets |
Planets with orbits beyond the earth
Saturn, Mars, Jupiter, Neptune, Uranus |
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Inferior Planet |
Plants with orbits that lie between the Sun + Earth
Mercury + Venus + Sun + Earth |
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Aphelion |
Earth's farthest distance from the sun
Ex. July 4th |
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Perihelion |
Earth's closet approach to the sun
Ex. Jan. 4th |
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Ecliptic |
The apparent path of the sun around the sky |
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Revolution |
Orbital motion about a point located outside the orbiting body |
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Roatation |
Motion around an axis through its center |
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Celestial Equator |
Imaginary line around the sky directly above Earth's equator |
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North Celestial Pole |
Point directly above Earth's North Pole Polaris |
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Photometer |
A device used to measure brightness of stars |
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Apparent Visual
Magnitude |
Brightness of star as seen by human eyes on Earth |
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Asterism |
Named group of stars that are part of a constellation Ex. Big Dipper/ Little Dipper |
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Constellation |
One of the stellar patterns identified by name associated with mythological gods, people, animals, or objects |
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Angular Separation |
Way of measuring the distance between objects (or size) in the sky |
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Precession |
Slow change in direction of Earth's axis of rotation |
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Right Ascension (RA) |
Distance measured eastward along the celestial equator in hours (Longitude) |
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Brightness = Magnitude |
Hipparchus (100 B.C.) Greek six classes of stars catalog first class star is the brightest Some Issues: 1. Translating catalog from Greek to Latin 2. fainter the star, the higher # will be 3. Some stars are close in Magnitude 4.Some stars are dimmer than his "six" class
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Declination (Dec) |
Angular distance above or below the celestial equator (latitude) |
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Apagee |
Moon farthest from the Earth |
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Perigee |
Moon closest to the Earth |
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Opposition |
configuration in which the Earth lies directly between a superior planet and the sun |
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Elongation |
Apparent angular separation between an astronomical object + the sun as seen from the Earth |
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Lunar Eclipse |
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Solar Eclipse |
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