Astronomy Hypertext_ Lunar and Solar Eclipses

Astronomy Hypertext_ Lunar and Solar Eclipses - Astronomy...

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Unformatted text preview: 1/15/12 Astronomy Hypertext: Lunar and Solar Eclipses As tronom H perte t L na and Sola Eclip e Lat est Modif icat ion: Jul 22, 2002 A h gh he M i e 400 i ea i g ha b h he S a d M Ea h. Thi d ce e f he Whe he M c e di ec be fa he Ea h' face. A ee S ' igh . Thi i a a ol a e a e ha he S , i i a e 400 i e ha e he a e a g a i e, ab 0.5 , a ee i e i ea d e i a cie ific c i cide ee he Ea h a d he S , he M ' had f ha i he M c e he S , b c i ecl i p e. A a ec i e i ib e he he M i bi i i c i ed he Ea h' bi a a e b ab e f he i ii bi he e ha bi i cc a ea ice each ea a d a ,b a ce , f he ce i a e. a fi g he ea a e ha e. Si ce he a e f he M ' 5 , he M addi i a be a ea e ec he Ea h' bi a a e. Thi i e e , fi e i e a ea . The a da i f he had he M ca d i g a a ec i e i ca ed he mb a; he pen mb a i he a ia had e ida i . If e a d i he b a had , e ee he S c e e c e ed b he M , a d hi i ca ed a o al ol a ecl i p e. If e a d i he e b a had , e ee a a ia c e ed S , a d hi i ca ed a pa i al ol a ecl i p e. The e b a had c e a ch a ge a ea he Ea h' face ha d e he b a had , a i g a a ia a ec i e i ib e e a ide egi ha a a a ec i e. The a e age e g h f he M ' c ica had i ie e a he M ' ea di a ce f he Ea h. A ann l a ol a ecl i p e a e ace he he M , i addi i he c di i de hich a a ia a a ec i e cc , i a fa he f he Ea h. A hi ii b a had i h each he Ea h, ha e ee he igh ae, da e ed di f he M ded b a b i ia i g f i - e ed S . U de he fa e 270 ide, f he ec i e a bei g ab 7.5 . T ab e be . ab e c di i hi e he e ge a g he a ec i e f i he Ea h' e a ia egi , he M ' b a had i b a had i c e 6000 ide. A hi i e, he a i a h f he ea a di g had , he a i e gh he 20- ea e i d f 1980 he ea 2000 a e i ed i he To al Sol a Ecl i p e f om 1980 o 2000 Date Feb a 16, 1980 4.3 Ce a Af ica, I dia J physics.gmu.edu/~jevans/ Duration of Totalit (min) 2.2 Sibe ia 31, 1981 /cyclicPhenomena_lunarSolarEclipses.html Whe re Vis ible on Earth 1/2 1/15/12 Astronomy Hypertext: Lunar and Solar Eclipses J ne 11, 1983 5.4 Indone ia No embe 22, 1984 2.1 Indone ia, So h Ame ica No embe 12, 1985 1.9 So h Pacific, An a c ica Ma ch 29, 1987 0.3 Cen al Af ica Ma ch 18, 1988 4.0 Philippine , Indone ia J l 22, 1990 2.6 Finland, A c ic Region J l 11, 1991 7.1 Ha aii, Cen al Ame ica, B a il J ne 30, 1992 5.4 So h A lan ic No embe 3, 1994 4.6 So h Ame ica Oc obe 24, 1995 2.4 So h A ia Ma ch 9, 1997 2.8 Sibe ia, A c ic Feb a 26. 1998 4.4 Cen al Ame ica Ag 2.6 Cen al E ope, Cen al A ia 11, 1999 U all , if an eclip e of he S n occ , an eclip e of he Moon p ecede o follo i b The Ea h, Moon, and S n a e hen fficien l in line fo he f ll Moon o mo e o all o in o he Ea h' hado p od cing a l na eclip e. Since he Ea h' diame e i nea l fo ha of he Moon, he conical- haped hado ca b he Ea h i abo fo ime ide ba e and fo ime longe han he Moon' hado . L na ecl i p e ma be pa i al o e e one on he da k ide of he Ea h eeing he l na eclip e a he ame ime. 2 eek . pa iall ime a he o al , A ea ma b ing a man a h ee l na eclip e - - o none a all. Mo e of en e ha e o eclip e of he S n and o of he Moon in each calenda ea . Cen ie of ob e ing eclip e a gh he Bab lonian ha eclip e ec a eg la in e al . Af e 18 ea and 10d o 11d , he ci c m ance of an eclip e a e epea ed app o ima el . B 200 B.C., Bab lonian a onome co ld p edic i h p i ing acc ac f e l na eclip e . Thei p edic ion me hod came abo b no ing n me ical ela ion , ha e oda o ld call an n me ical algo i hm, in ab la ed ob e a ion , a he han de i ing a geome ical ela ion hip fo he S n, Moon, and he Ea h a he G eek la e did. 1995, J. C. Ev ans Physics & Ast ronomy Depart ment , George Mason Univ ersit y Maint ained by J. C. Ev ans; j ev [email protected] physics.gmu.edu/~jevans/ /cyclicPhenomena_lunarSolarEclipses.html 2/2 ...
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