Параллактический угол

Параллактический треугольник, P — полюс, Z — зенит, R — точка где находится центр светила, и есть параллактический угол

Параллактический угол — термин из сферической астрономии, обозначает угол параллактического треугольника, в котором находится светило. Параллактический угол обозначается буквой . Параллактический угол также можно определить как угол между кругом склонений и кругом высот светила[1].

Когда светило находится на небесном меридиане, параллактический угол равен нулю, в противном случае параллактический угол берётся положительным, если светило находится к западу от меридиана, и отрицательным, если находится к востоку. Для светила, находящегося в зените или в точке северного полюса мира, параллактический угол не определён.

Расчёт

Для наблюдателя находящегося в точке с широтой φ и для точки на небесной сфере со склонением δ и часовым углом t параллактический угол определяется через формулы сферической тригонометрии как:

Примечания

  1. 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. — 462 с.

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