401.

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. Mon, 24 Jan 2000 at 12:59 EDT (8,916 days ago) in Capricornus

402.

Saturn ends retrograde motion Saturn returns to its usual eastward motion after opposition. Tue, 11 Jan 2000 at 23:45 EDT (8,928 days ago) in Aries

403.

Jupiter ends retrograde motion Jupiter returns to its usual eastward motion after opposition. Mon, 20 Dec 1999 at 09:58 EDT (8,951 days ago) in Pisces

404.

Mars at perihelion Mars passes its orbit's closest point to the Sun. Thu, 25 Nov 1999 at 09:15 EDT (8,976 days ago) in Capricornus

405.

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. Sat, 06 Nov 1999 at 08:44 EDT (8,995 days ago) in Aries

406.

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. Sat, 23 Oct 1999 at 14:56 EDT (9,009 days ago) in Pisces

407.

Uranus ends retrograde motion Uranus returns to its usual eastward motion after opposition. Sat, 23 Oct 1999 at 01:11 EDT (9,009 days ago) in Capricornus

408.

Jupiter at perigee Jupiter reaches its closest point to the Earth – marking the best time to observe it in 1970. Fri, 22 Oct 1999 at 10:06 EDT (9,010 days ago) in Pisces

409.

Neptune ends retrograde motion Neptune returns to its usual eastward motion after opposition. Wed, 13 Oct 1999 at 21:34 EDT (9,019 days ago) in Capricornus

410.

Saturn enters retrograde motion Saturn reverses its direction of motion across the sky. Sun, 29 Aug 1999 at 21:51 EDT (9,064 days ago) in Aries

411.

Jupiter enters retrograde motion Jupiter reverses its direction of motion across the sky. Tue, 24 Aug 1999 at 22:38 EDT (9,069 days ago) in Aries

412.

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. Sat, 07 Aug 1999 at 14:29 EDT (9,086 days ago) in Capricornus

413.

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. Mon, 26 Jul 1999 at 05:23 EDT (9,098 days ago) in Capricornus

414.

Mars ends retrograde motion Mars returns to its usual eastward motion after opposition. Fri, 04 Jun 1999 at 02:11 EDT (9,150 days ago) in Virgo

415.

Uranus enters retrograde motion Uranus reverses its direction of motion across the sky. Fri, 21 May 1999 at 18:31 EDT (9,164 days ago) in Capricornus

416.

Jupiter at perihelion Jupiter passes its orbit's closest point to the Sun. Wed, 19 May 1999 at 15:30 EDT (9,166 days ago) in Pisces

417.

Neptune enters retrograde motion Neptune reverses its direction of motion across the sky. Thu, 06 May 1999 at 20:21 EDT (9,179 days ago) in Capricornus

418.

Mars at perigee Mars reaches its closest point to the Earth – marking the best time to observe it in 1970. Sat, 01 May 1999 at 13:21 EDT (9,184 days ago) in Virgo

419.

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. Tue, 27 Apr 1999 at 06:54 EDT (9,188 days ago) in Aries

420.

Mars at opposition Mars lies in the opposite direction to the Sun in the sky, making it closer, brighter and larger than at other times. It is also optimally positioned to be observable for much of the night. Sat, 24 Apr 1999 at 13:31 EDT (9,191 days ago) in Virgo