Astronomy Hypertext_ Precession of the Equinoxes

Astronomy Hypertext_ Precession of the Equinoxes - 1/15/12...

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Unformatted text preview: 1/15/12 Astronomy Hypertext: Precession of the Equinoxes As tronom H perte t Precession of the Equino es Lat est Modif icat ion: July 22, 2002 I he ec d ce B.C. he G ee a e Hi a ch (190?- ?120 B.C.) c a ed he ii f he i ci a a i he diac i h h e hich a e had ed 100 ea ea ie . He f d ha he e a e i had hif ed e a d ab 1 a g he ec i ic. Wha he di c e ed i ca ed he precessi on of t he equi no es. The Ea h i a e fec he e; i b ge igh a d he e a . The g a i a i a a ac i f b h he S a d he M ie he Ea h' e a ia b ge i he Ea h' a d he M ' bi a a e . Ac i g i e a i i g , he a i g Ea h e i hi . The e , he ef e, f he S ' a d M ' a ac i a d he Ea h' e i a ce i ha he Ea h' a i f ai e e ada d he e f he ec i ic. Beca e f hi , he i f i e ec i be ee he ce e ia e a a d he ec i ic hif e a d a g he ec i ic a a a e f ab 50 i e f a c e ea e 1 e ce . Thi ca e he e i e ece c ee a d he ec i ic i 25,800 ea . The Ea h' a i e ai i i f 23.5 h gh he c c e f ece i . T da , he a i di ec ed ada i he e ha 1 f he a P a i . A he i e f a cie he a i i ed i he di ec i f he a Th ba (A ha D ac i ), hich a he deg ee f he e a d hich he hea e a ed. B A.D. 14,000, he e b igh Vega (A ha L ae) i be he "N h S a " a d a he a i ae ii f he ce e ia ef de ce da . i Eg a fe a h 1995, J. C. Ev ans Physics & Ast ronomy Depart ment , George Mason Univ ersit y Maint ained by J. C. Ev ans; j ev ans@gmu.edu physics.gmu.edu/~jevans/ /cyclicPhenomena_precessionEquinoxs.html 1/1 ...
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