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This Concept Map, created with IHMC CmapTools, has information related to: Observation on sun and moon (Jc Ong), Celestial sphere definition sphere rotate, sun,moon and earth lie on line of node, right angle use geometry, lunar phases due to moon orbit, moon observvation by Erathostenes, moon notice sun,moon and earth, heliocentric model definition sun centered, Observation idea Celestial sphere, sun,moon and earth form right angle, changes in angle and direction due to earth rotation (west to east), Telescope support earth rotation (west to east), sun, moon and stars motion acroos the sky east to west, moon notice lunar phases, moon notice changes in angle and direction, right angle during first and third lunar pahses, Erathostenes discover sun,moon and earth, line of node cause eclipse, Celestial sphere definition earth constant, earth rotation (west to east) cause sun, moon and stars, heliocentric model definition planets orbit sun