ASTR 1210 Lecture Notes - Lecture 5: Celestial Equator, Right Ascension, Ecliptic
27 Aug 2016
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Measured from the equator (0*), to 90* at ncp, -90*scp. The spin of an object about its axis. The earth rotates once a day (once every 24 hrs) Earth revolves around the sun every 365. 26 days. Line the sun follows, goes through the 12 zodiacs. Tilted by 23. 5* with respect to the ecliptic. When the sun crosses the equator when going from south of the equator to north of the equator. When the sun is at its furthest north. Position of the sun: r. a. 6h, dec +23. 5o. When the sun is at its furthest south. Position of the sun: ra: 18^h, dec -23. 5. Where sunlight hits straight overhead on summer solstice. Where sunlight hits straight overhead on winter solstice. Inside arctic circle, on summer solstice sun never sets. Sun does not rise for people within 23. 5 degrees of the south pole (below the antarctic circle) Many people carry the misconception that the seasons are due to the distance of the.
