Opposition

by Dominic Ford, Editor
Last updated: 16 Jul 2020
Opposition

Mars at opposition in 2001, as seen by the Hubble Space Telescope. Image courtesy of NASA.

An astronomical body is said to be at opposition when it makes its closest approach to the point directly opposite to the Sun in the night sky.

This means that the object will appear highest in the sky at around midnight, local time, and will be above the horizon for much of the night.

For objects which orbit further out in the Solar System than the Earth – almost all bodies other than Mercury and Venus – this configuration happens when the Solar System is aligned such that the object lies in a straight line with the Earth and the Sun, the Earth being in the middle.

Consequently, this is also the time when the object makes its closest approach to the Earth, making it appear at its largest and brightest in the night sky.

List of oppositions

The table below lists the dates when objects are at opposition in 2021, computed from NASA's DE430 planetary ephemeris. To show events in other years, use the control below.

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Objects at opposition in 2021

Date Object Declination
Date Object Declination
02 Aug 2021 02:06 EDTSaturn at opposition18°31'SMore information »
19 Aug 2021 20:20 EDTJupiter at opposition13°38'SMore information »
14 Sep 2021 05:12 EDTNeptune at opposition4°27'SMore information »
04 Nov 2021 19:49 EDTUranus at opposition15°10'NMore information »

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41.14°N
73.26°W
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