Back الاقتران العظيم Arabic Вялікае злучэнне Byelorussian Gran conjunció Catalan Große Konjunktion German Gran Conjunción Spanish Konjuntzio handi Basque مقارنه کیوان و مشتری Persian Grande conjonction French Velika konjunkcija Croatian Konjungsi agung ID

Great conjunction

Stacked photograph of the great conjunction of 2020 four hours before closest approach, with Jupiter 6–7 arcminutes below Saturn. The moons Io, Ganymede, Europa, and Titan are visible.

A great conjunction is a conjunction of the planets Jupiter and Saturn, when the two planets appear closest together in the sky. Great conjunctions occur approximately every 20 years when Jupiter "overtakes" Saturn in its orbit. They are named "great" for being by far the rarest of the conjunctions between naked-eye planets[1] (i.e. excluding Uranus and Neptune).

The spacing between the planets varies from conjunction to conjunction with most events being 0.5 to 1.3 degrees (30 to 78 arcminutes, or 1 to 2.5 times the width of a full moon). Very close conjunctions happen much less frequently (though the maximum of 1.3° is still close by inner planet standards): separations of less than 10 arcminutes have only happened four times since 1200, most recently in 2020.[2]

  1. ^ Ford, Dominic (20 October 2020). "Great Conjunction". In The Sky. Retrieved 22 December 2020.
  2. ^ Cite error: The named reference auto3 was invoked but never defined (see the help page).

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