Astronomy Test 1
Terms
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- Polaris
- is the brightest star in the Ursa Minor constellation
- Circumpolar
- stars close enough to the poles that they never rise or set
- Altitude
- the angle between a star and the horizon.
- Azimuth
- he angle from the northernmost point of the horizon to the point on the horizon nearest the object
- Zenith
- Point directly overhead
- Nadir
- Point directly opposite the Zenith, directly below
- Zodiac
- A cluster of constellations that make up the 12 time periods of the ecliptic
- Summer Solstice
- When the sun is at its northernmost point above the celestial equator
- Winter Solstice
- Southernmost point above the celestial equator
- Vernal equinox
- when the sun crosses the celestial equator moving north on March 21
- Autumnal equinox
- when the sun crosses the celestial equator moving south on September 22
- Most associated with the greek world view
- Aristotle
- Rejected the Geocentric world view and supported the Heliocentric view
- Aristarchus
- accurately determined the size of the Earth
- Eratosthenes
- Geocentric model of the Universe
- Earth is center of universe
- Heliocentric model of the Universe
- Sun centered around Universe - Felt god should be the center of the universe