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2. Opredelenie radianta potoka
ctgap = (sinan* ctgd n - sinak* ctgd k) / (cosa n* ctgd n - cosa k* ctgd k),
tgdp = - ctgd n *cos(ap - a n) = - ctgd k *cos(ap - a k),
gde (ap, dp) - koordinaty polyusa bol'shogo meteornogo kruga,
(an, d n)- koordinaty nachala meteora,
(ak, d k) - koordinaty konca meteora.
Esli izvestny koordinaty nachala i konca puti hotya by dlya dvuh meteorov, to koordinaty radianta meteornogo potoka (ar, dr) opredelyayutsya po tem zhe formulam, chto i koordinaty polyusa, no v formulah vmesto koordinat nachal i koncov meteorov neobhodimo podstavit' poluchennye koordinaty polyusov bol'shih krugov kazhdoi pary meteorov.
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