<< 1.10. Nachal'nye usloviya ili ...
| Oglavlenie |
1.12. Celi yasny, nuzhny ukazaniya >>
1.11. Bez efemeridy - v nikuda
Standart MAS1976 rekomenduet polozheniya Solnca, Luny i bol'shih planet vychislyat' na osnove efemeridy DE200/ LE200.
Efemeridnye dannye DE200/LE200, rasprostranyaemye na magnitnyh nositelyah, sostoyat iz zapisei dlinoi 6608 bait. Kazhdaya zapis' soderzhit 826 chisel dvoinoi tochnosti v dvoichnom formate po 8 bait. V odnoi zapisi upakovana informaciya o polozheniyah i skorostyah nebesnyh ob'ektov na intervale vremeni, ravnom 32 sutkam. Pervoe chislo - yulianskaya data nachala intervala prognozirovaniya, vtoroe chislo - konechnaya yulianskaya data dannogo intervala, obrazovannaya pribavleniem 32 sutok k nachal'noi date. Polozheniya i skorosti planet i Solnca dany otnositel'no baricentra Solnechnoi sistemy. Vmesto koordinat Zemli upakovany koefficienty dlya vychisleniya polozheniya centra mass sistemy Zemlya-Luna. Polozhenie Luny dano otnositel'no centra Zemli. Ves' massiv iz 826 chisel rasshifrovyvaetsya s pomosh'yu pyati massivov celyh chisel:
| ob'ekt | 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
- nachal'nyi nomer v massive,
- konechnyi nomer v massive,
- chislo koefficientov approksimacii,
- interval chastnoi approksimacii v dnyah vnutri obshego
intervala,
- kolichestvo approksimiruemyh peremennyh.
Rassmotrim, dlya primera, algoritm vychisleniya polozheniya Venery otnositel'no centra Zemli.
Pust' 
- data v yulianskih dnyah v shkale dinamicheskogo baricentricheskogo vremeni TDB,
vybrannaya dlya vychislenii, 
, 
- nachal'naya i konechnaya daty efemeridnyh dannyh. Prezhde
vsego opredelim poryadkovyi nomer togo tridcatidvuhsutochnogo intervala, v kotoryi popadaet
vybrannyi nami moment
:
celomu znacheniyu vyrazheniya 
i centra
mass Zemlya-Luna 
otnositel'no baricentra Solnechnoi sistemy i polozhenie Luny
otnositel'no centra Zemli. Vychislyaem vektor polozheniya Zemli
otnositel'no
baricentra
raven otnosheniyu massy Luny k masse Zemli, a zatem etot vektor
vychitaem iz sootvetstvuyushego vektora dlya planety Venera. Esli eti zhe raschety provodyatsya s uchetom
skorosti rasprostraneniya sveta, to polozhenie Venery otnositel'no baricentra vychislyaetsya v moment
vremeni, predshestvuyushii dannomu i opredelyaemyi dvumya-tremya iteraciyami.
<< 1.10. Nachal'nye usloviya ili ... | Oglavlenie | 1.12. Celi yasny, nuzhny ukazaniya >>
|
Publikacii s klyuchevymi slovami:
astrometriya - lazernaya lokaciya
Publikacii so slovami: astrometriya - lazernaya lokaciya | |
Sm. takzhe:
Vse publikacii na tu zhe temu >> | |
