AS101 Chapter Notes - Chapter 2: Orbit, Lunar Eclipse, Declination
Document Summary
Constellations: definition: one of the stellar patterns identified by name, usually of mythological gods, people, animals or objects. Also region of the sky containing star patterns: asterism: a named grouping of stars that is not one of the recognized constellations, some stars are much farther away from each other in constellations. Australians see many constellations and asterisms invisible from. North america, but they never see the big dipper: astronomers measure distances across the sky as angles expressed in units of degrees and subdivisions of degrees called arc minutes and arc seconds. Precession: precession: the slow change in orientation of the earth"s axis of rotation. The annual motion of the sun: rotation: motion around an axis passing through the rotation body, revolution: orbital motion about a point located outside orbiting body. The seasons: seasons are caused by the revolution of earth around the sun, two important principles, seasons are not caused by variation in the distance between earth and sun,
