P. V. Artemii
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Pomogite ili ob'yasnite.
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26.02.2008 16:49 |
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Pishu diplom po morehodnoi astronomii, doshel do chasti gde neobhodimo napisat' samomu programmu dlya
vychisleniya polozheniya planet (Venera, Mars, Yupiter, ,Saturn). No voznikla problema.
V knige Miusa "Astronomicheskie algoritmy", est' vychisleniya geliocentricheskih shirot, dolgot i radius-
vektorov planet.
Tam imeetsya takaya formula:
L = (L0 + L1*t +L2*t*t +L3*t*t*t +L4*t*t*t*t +L5*t*t*t*t*t)/100 000 000 (rad)
V konce imeyutsya prilozheniya gde est' vse eti koefficienty (L0,L1,L2,L3,L4,L5), no ya ne mogu ponyat' po
kakomu principu ih vybirat' i dlya chego daetsya formula
L0=A*Cos(B+C*t)
L0: A B C
1 1.0564 3.6933 89624555.3
2 1803.0 4.1033 5661.3320
3 . . .
3 . . .
4 . . .
5 . . .
i t.d
Tak ponimayu vse eti koef-ty podstavlyayutsya v formulu L0=A*Cos(B+C*t) t.e.:
L0=1.0564 *cos(3.6933+89624555.3*t)
+1803.0*cos(4.1033+5661.3320*t)
+........ i t.d
Eto tak?
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V. V. Chazov
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Re: Pomogite ili ob'yasnite.
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27.02.2008 9:10 |
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Uvazhaemyi kollega. Vy vse pravil'no napisali. V modelyah dvizheniya planet prisutstvuyut
mnogochleny po vremeni (koefficienty L0,L1,...), no est' takzhe i periodicheskie izmeneniya
dolgoty (nulevogo koefficienta L0), shiroty i rasstoyaniya ot Solnca. Periodicheskie izmeneniya
nado uchityvat' po privodimoi Vami formule.
Osobennogo fizicheskogo smysla v etih chislovyh koefficientah net, osobenno v koefficientah
mnogochlenov po stepenyam vremeni. Tak prinyato dlya udobstva vychislenii: formuly prostye,
korotkie i obespechivayut prilichnuyu tochnost' na intervalah vremeni 100-200 let.
S poklonom, Vadim.
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