SFERAI OSMONI

SFERAI OSMONI, gumbazi osmon, falak, sferai yoridihandai khayolii radiusash ikhtiyorist,Sferai osmoni, a: Z — zenit, Z’ — nadir: NESW — ufuqi matematiki: N, E, S, V — nuqtahoi shimol, sharq, janub va garb; R va R’ — qutbhoi shimoli va janubii dunyo; AWA’E — ekvatori osmoni;  — arzi geografi; b: AA’ — nuqtahoi etidoli bahoriyu tiramohi; E va E’ — nuqtahoi inqilobi tobistoni va zimistonii Oftob, P va P’ — qutbhoi shimoli va janubii ekliptika,

s = 23⁰37′,

ki baroi muayyan kardani koordinataho, mavqei baynihamdigari va harakati jismhoi kayhoni imkon medihad. Dar Sferai osmoni doirahoi khurd (bo sfera hammarkazand), doirahoi kalon (markazashon dar markazi sfera namekhoband), ufuqi matematiki, zenit (samti ras), nadir (samti nazir), nuqtahoi Janub, Shimol., Shimol va Garb, qutbhoi dunyo, ekvator va meridiani osmoni, ekliptika, nuqtahoi inqilobi Oftob va etidoli bahoriyu tiramohiro az ham farq mekunand.