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astr101_02_PathOfTheSun (2).pptx - Astronomy 101 Path of...

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Astronomy 101Path of the Sun
Review: The Celestial SphereEcliptic= apparent pathof the Sun across theCelestial Sphere.Ecliptic and the celestialequator are tilted 23.5ofrom each other.This tilt is actually causedbecause the Earth’srotational axis is tiltedrelative to the plane ofthe Solar System.2
Review: Local Sky3– the point directly overhead– all points90ofromzenith– line passing through thezenith and connecting Nand S on horizon
Daily Motion of the Sun4westsouthmeridianeastZenith or overheadXPMorpostmeridianAMorantemeridianLocal noon
Motion of the SunThedailymotion of the Sun is caused by therotation of the Earth on its axisLocal noon– when the Sun crosses the meridian;this is when the Sun is at its highest point in thesky.How does the time of local noon (or sunrise orsunset) vary as you move east/west across the US?The changing position of the Sun over the courseof ayearis caused by the Earth moving aroundthe Sun.5
Where is the Sun at Noon Today?6eastwestsouthzenithhere orthere?

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Term
Winter
Professor
bennert
Tags
Zenith

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