581.

Mars at solar conjunction Mars is unobservable as it passes around the far side of the Sun – marking the end of one apparition and the beginning of the next. Fri, 08 Nov 1991 at 03:49 EDT (11,970 days ago) in Libra

582.

Mars at apogee Mars reaches its furthest point from the Earth, as it passes around the far side of the Sun. Fri, 11 Oct 1991 at 05:51 EDT (11,998 days ago) in Virgo

583.

Saturn ends retrograde motion Saturn returns to its usual eastward motion after opposition. Fri, 04 Oct 1991 at 23:27 EDT (12,005 days ago) in Capricornus

584.

Neptune ends retrograde motion Neptune returns to its usual eastward motion after opposition. Thu, 26 Sep 1991 at 02:18 EDT (12,013 days ago) in Sagittarius

585.

Uranus ends retrograde motion Uranus returns to its usual eastward motion after opposition. Thu, 19 Sep 1991 at 04:23 EDT (12,020 days ago) in Sagittarius

586.

Jupiter at apogee Jupiter reaches its furthest point from the Earth, as it passes around the far side of the Sun. Sun, 18 Aug 1991 at 04:23 EDT (12,052 days ago) in Leo

587.

Jupiter at solar conjunction Jupiter is unobservable as it passes around the far side of the Sun – marking the end of one apparition and the beginning of the next. Sat, 17 Aug 1991 at 18:13 EDT (12,053 days ago) in Leo

588.

Saturn at opposition Saturn lies in the opposite direction to the Sun in the sky, making it slightly closer, brighter and larger than at other times. It is also optimally positioned to be observable for much of the night. Fri, 26 Jul 1991 at 20:13 EDT (12,075 days ago) in Capricornus

589.

Neptune at opposition Neptune lies in the opposite direction to the Sun in the sky, making it optimally positioned to be observable for much of the night. Sun, 07 Jul 1991 at 20:19 EDT (12,094 days ago) in Sagittarius

590.

Uranus at opposition Uranus lies in the opposite direction to the Sun in the sky, making it optimally positioned to be observable for much of the night. Thu, 04 Jul 1991 at 02:55 EDT (12,097 days ago) in Sagittarius

591.

Mars at aphelion Mars passes the furthest point along its orbit from the Sun. Sat, 08 Jun 1991 at 21:18 EDT (12,123 days ago) in Cancer

592.

Saturn enters retrograde motion Saturn reverses its direction of motion across the sky. Thu, 16 May 1991 at 23:24 EDT (12,146 days ago) in Capricornus

593.

Neptune enters retrograde motion Neptune reverses its direction of motion across the sky. Thu, 18 Apr 1991 at 18:37 EDT (12,174 days ago) in Sagittarius

594.

Uranus enters retrograde motion Uranus reverses its direction of motion across the sky. Thu, 18 Apr 1991 at 05:35 EDT (12,174 days ago) in Sagittarius

595.

Jupiter ends retrograde motion Jupiter returns to its usual eastward motion after opposition. Sat, 30 Mar 1991 at 07:58 EDT (12,193 days ago) in Cancer

596.

Jupiter at opposition Jupiter lies in the opposite direction to the Sun in the sky, making it slightly closer, brighter and larger than at other times. It is also optimally positioned to be observable for much of the night. Mon, 28 Jan 1991 at 19:18 EDT (12,254 days ago) in Cancer

597.

Jupiter at perigee Jupiter reaches its closest point to the Earth – marking the best time to observe it in 1970. Mon, 28 Jan 1991 at 03:00 EDT (12,254 days ago) in Cancer

598.

Saturn at solar conjunction Saturn is unobservable as it passes around the far side of the Sun – marking the end of one apparition and the beginning of the next. Fri, 18 Jan 1991 at 02:35 EDT (12,264 days ago) in Sagittarius

599.

Neptune at solar conjunction Neptune is unobservable as it passes around the far side of the Sun – marking the end of one apparition and the beginning of the next. Fri, 04 Jan 1991 at 22:13 EDT (12,278 days ago) in Sagittarius

600.

Mars ends retrograde motion Mars returns to its usual eastward motion after opposition. Tue, 01 Jan 1991 at 07:55 EDT (12,281 days ago) in Taurus