Measuring the Sky - Measuring the Sky We measure the sky in...

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Measuring the Sky We measure the sky in angles, not distances Full circle = 360º = 60 arcmin 1 arcmin = 60 arcsec The Local Sky Zenith- the point directly above you Horizon- all points 90° from the zenith Altitude- the angle above the horizon Meridian- due north horizon zenith due south horizon Specify altitude and direction along the horizon to pinpoint a spot in the local sky Latitude: position north or south of equator Longitude: position east or west of prime meridian (runs through Greenwich, England) As the Earth rotates, the sky appears to us to rotate in the opposite direction. The sky appears to rotate around the N (or S) celestial poles. If you are standing at the poles, nothing rises or sets. to the horizon. As the Earth orbits the Sun, the Sun appears to move eastward with respect to the stars.
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Measuring the Sky - Measuring the Sky We measure the sky in...

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