Ch 2 Observing the Sky

Earth at the center of the universe

circle around Earth that is our night sky

Right over your head, 90 degrees N

Where the sky meets the ground, 360 degrees around you

90 degrees from the celestial poles, projection of the Earth's equator

Projection of Earth's poles, in the same place

stars within 38 degrees of the N celestial pole, part of the sky that never sets if your in the N hemisphere

stars within 38 degrees of the S celestial pole, part of the sky that never rises if your in the N hemisphere

Star that is closest to the north celestial pole, North Star

the path the sun appears to take around the celestial sphere

4

doesn't

the stars that seem to maintain a fixed pattern in the sky

the planets and moon that seem to move across the sky

distance ÷ time

18 degree belt that the individual paths of the moon & planets all fall within, close to the ecliptic

88 sectors that we've divided the sky into

indicator of especially noticeable star pattern within a constellation