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Re[18]: Smeshenie perigeliya Merkuriya i drugih planet
17.01.2008 15:19 | S. Yu. Yudin

Vadim, bol'shoe spasibo. Sil'no menya vyruchili s polinomami Chebysheva, no pereiti k vychisleniyam ya poka ne mogu, t.k. ostalis' ne vyyasnennymi nekotorye momenty. Naprimer, Vy dlya vychisleniya i koordinat i skorostei zapisali v formulah odni i te zhe koefficienty a_0, a_1, a_2 a_m, a v faile DE405 soderzhitsya v dva raza bol'she zapisei (chisel) v kazhdom bloke dannyh, chem v DE200, t.e. 1652 protiv 826. I, esli kolichestvo approksimiruemyh peremennyh i chislo koefficientov approksimacii ostalos' to zhe samoe, to ne ponyatno, chto approksimiruyut lishnie 826 zapisei v faile DE405. Ya dumal, chto eto koefficienty dlya skorostei, a u Vas vyhodit, chto skorosti mozhno opredelit' po tem zhe samym koefficientam, chto i koordinaty. Kakova voobshe struktura dannyh v DE405. Kak ya ponyal v DE200, naprimer, dlya Merkuriya s tret'ei pozicii idut koefficienty a_0_X, a_0_Y, a_0_Z a_m_X, a_m_Y, a_m_Z, a kolichestvo koefficientov i drugie parametry opredelyayutsya po sheme, kotoruyu ya prochital v stat'e, raspolozhennoi na Vashem saite, a konkretno // Ves' massiv iz 826 chisel rasshifrovyvaetsya s pomosh'yu pyati massivov celyh chisel:
N object i j k l m
1 Mercury 3 146 12 8 3
2 Venus 147 182 12 32 3
3 Earth-Moon 183 272 15 16 3
4 Mars 273 302 10 32 3
5 Jupiter 303 329 9 32 3
6 Saturn 330 353 8 32 3
7 Uranus 354 377 8 32 3
8 Neptune 378 395 6 32 3
9 Pluto 396 413 6 32 3
10 Moon 414 701 12 4 3
11 Sun 702 746 15 32 3
12 Nutation 747 826 10 8 2
gde i - nachal'nyi nomer v massive, j - konechnyi nomer v massive, k - chislo koefficientov approksimacii, l interval chastnoi approksimacii v dnyah vnutri obshego intervala, m - kolichestvo approksimiruemyh peremennyh.// Zhelatel'no by vzglyanut' na podobnuyu shemu i dlya faila DE405. I potom, v svyazi s tem, chto dlya Merkuriya vnutri obshego intervala vremeni dlya dannyh sushestvuyut eshe i chastnye intervaly, to poluchaetsya, chto x(t_c)=[t_c-0.5*(t_b+t_a)]/[0.5*(t_b-t_a)] nado rasschityvat' po znacheniyam t_a i t_b, kotorye budut ravny vremeni na koncah chastnogo intervala. Ili ya ne prav i ih nado brat' v nachale i konce obshego intervala, a koefficienty ispol'zovat' iz chastnogo intervala.

S nailuchshimi pozhelaniyami Sergei Yudin.




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