astro092711 - Astronomy Sept. 27th, 2011 Water on Mars? :o...

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Astronomy Sept. 27 th , 2011 Water on Mars? :o Clear, white caps on the Northern side of Mars Frost! Dry ice Sublimation – solid to gas; “skip a phase” Mars has climate, weather, seasons Dynamic What drives the change of climate over Mars in relation to the Solar System? *The Earth is closer to the sun in January and is closer to the sun in July. The seasons have nothing to do with the distance from the Earth to the sun. The Celestial Sphere The stars actually lie at different distances Stars sitting still; Earth rotating. As the year goes by, the Sun moves with respect to the background of stars. The path followed by the Sun over the course of the year is called the ecliptic . The way stars move also differs from place to place. Non-circumpolar stars, (and Sun, Moon, planets) rise in East and set in West at an angle = [90º – your latitude] the angle of obliquity – the tilt of the Earth. 23.5º
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This note was uploaded on 04/04/2012 for the course ASTRON 101 taught by Professor Schneider during the Fall '08 term at UMass (Amherst).

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astro092711 - Astronomy Sept. 27th, 2011 Water on Mars? :o...

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