Classes of stars Notes - Classes of stars circumpolar...

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Classes of stars circumpolar stars: δ > (90 - φ) stars that rise and set: stars never seen: δ = declination of star φ = observer’s latitude celestial sphere : Earth at center • horizonsystem : altitude,azimuth altitude of pole star = your latitude equatorial system : right ascension, declination meridian : semicircle through SCP, NCP • observer’s meridian : circle through NCP, SCP, zenith, South point ecliptic : apparent path of the Sun on the sky • equinoxes and solstices : Vernal Equinox, Autumnal Equinox, Summer Solstice, Winter Solstice • circumpolar stars : always visible above horizon ecliptic obliquity - angle between CE and ecliptic = 23.5 degrees (tilt of Earth’s axis of rotation) Vernal Equinox (VE) - intersection of ecliptic and CE (Sun moving North) Autumnal Equinox (AE) - intersection of ecliptic and CE (Sun moving South) Summer Solstice (SS) - highest point of Sun in sky Winter Solstice (WS) - lowest point of Sun in sky
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This note was uploaded on 01/11/2012 for the course ASTRO 005 taught by Professor Janecharlton during the Fall '09 term at Pennsylvania State University, University Park.

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Classes of stars Notes - Classes of stars circumpolar...

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