ASTRON 103 Chapter Notes - Chapter 5: Celestial Equator, Dailymotion, North South Mrt Line
5 Oct 2016
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Horizon: the line where the sky appears to meet the earth. Constellation: recognized grouping of stars: sky divided into 88 constellations, example: leo. Asterisms: unofficial grouping of stars: sometimes they are part of a larger constellation, example: the big dipper. Naming constellations: based on shapes, historical significance, locations, etc, constellation names come mostly from the classical world (greece & rome) Because stars take tens of thousands of years to make any noticeable shift (light years ), we see today some pattern of stars seen by our ancestors as well. Star in night sky change position drastically after little time (just as is widely noticed in the sun - sunrise sunset: because . As earth spins, we face different parts of the celestial sphere. Rising & setting of sun & other stars is not accurate because earth is doing the spinning.
