Паралактичний кут

Паралакти́чний кут^[1] — термін зі сферичної астрономії, позначає кут паралактичного трикутника, в якому перебуває світило. Паралактичний кут позначається буквою $q$ . Паралактичний кут також можна визначити як кут між колом схилень $(\delta )$ і колом висоти $(h)$ світила^[2].

Коли світило перебуває на небесному меридіані, паралактичний кут дорівнює нулю, в іншому випадку паралактичний кут береться додатним, якщо світило перебуває на захід від меридіана, і від'ємним, якщо на схід. Для світила, що перебуває в зеніті або в точці північного полюса світу, паралактичний кут не визначено.

Розрахунок

Для спостерігача, що перебуває в точці з широтою φ і для точки на небесній сфері зі схиленням δ і годинним кутом t паралактичний кут визначається за формулами сферичної тригонометрії як:

q=\arctan \left({\frac {\sin(t)}{\tan(\varphi )\cos(\delta )-\sin(\delta )\cos(t)}}\right)

Примітки

↑ Паралактичний кут // Астрономічний енциклопедичний словник / за заг. ред. І. А. Климишина та А. О. Корсунь. — Львів : Голов. астроном. обсерваторія НАН України : Львів. нац. ун-т ім. Івана Франка, 2003. — С. 344. — ISBN 966-613-263-X.
↑ Попов П. И., Баев К. Л., Воронцов-Вельяминов Б. А., Куницкий Р. В. §19 Параллактический треугольник. Преобразование координат. // Астрономия. — четвёртое. — М : Учпедгиз, 1958. — С. 57 — 60.

Література

Параллактический угол // Энциклопедический словарь Брокгауза и Ефрона : в 86 т. (82 т. и 4 доп. т.). — СПб., 1890—1907. (рос. дореф.)

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