Daily Motion.

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Presentation transcript:

Daily Motion

Local Sky Depending on your location on earth you see completely different stars! Some stars are always visible, they are circumpolar.

Local Sky (cont’d) The local sky at 40 degrees latitude

Daily Rising and Setting Due to the rotation of the Earth around its axis Period of rotation: 1 siderial day= 23h56m4.1s 1 solar day (Noon to Noon) =24h Stars rotate around the North Star – Polaris Why are these different? Circumpolar – never rise or set 4

What time is it? Depends on where you are on the Earth! Time zones ensure that the noon is really noon, i.e. sun is at highest point To avoid confusion, use universal time (UT), the time at the meridian in Greenwich UT = EST + 5 hrs Daylight savings adds one hour in spring, so UT = EDT+ 4 hrs

The Time Zones Established to insure that sun is at highest point approximately at noon in the middle of the time zone