Lecture6.pdf - The Seasons assigned reading: Section 4.2...

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Earth’srotation axisis tilted 23 1/2 degrees with respectto the Sunthis tilt gives rise to theseasonsThe Seasonsassigned reading:Section 4.2The Sun moves along the ecliptic over the course of a year --it can be as far as 23 1/2 degreesaboveorbelowthe celestialequatorAs a result, theSun will appearhigher (or lower)in the sky,depending on thetime of year andwhere you livethe Sun also rises& sets in differentdirections overthe year!June 21 =Summer Solsticesummer in N. HemisphereSun highest in skymost daylight hoursThe seasons are reversed in the Southern hemisphereDec 21 =Winter Solsticewinter in N. HemisphereSun lowest in skyleast daylight hoursJune 21: Summer SolsticeNorthern SummerSouthern Winter(C) R. Pogge, OSULight more ‘direct’(higher overhead)hotterLight more spreadout (lower in sky)cooler
Picture shows Sun (as viewed from Earth) at its furthest from Sun(aphelion) and its closest (perihelion - in January!).

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Term
Spring
Professor
Tabak
Tags
Earth s rotation axis

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