401.

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. Tue, 25 Oct 2039 at 14:15 EDT (5,636 days away) in Pisces

402.

Uranus enters retrograde motion Uranus reverses its direction of motion across the sky. Tue, 08 Nov 2039 at 15:55 EDT (5,650 days away) in Cancer

403.

Mars enters retrograde motion Mars reverses its direction of motion across the sky. Wed, 23 Nov 2039 at 15:48 EDT (5,665 days away) in Gemini

404.

Mars at perigee Mars reaches its closest point to the Earth – marking the best time to observe it in 1970. Wed, 28 Dec 2039 at 09:40 EDT (5,700 days away) in Gemini

405.

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. Mon, 02 Jan 2040 at 10:21 EDT (5,705 days away) in Gemini

406.

Neptune ends retrograde motion Neptune returns to its usual eastward motion after opposition. Wed, 11 Jan 2040 at 01:52 EDT (5,714 days away) in Pisces

407.

Jupiter enters retrograde motion Jupiter reverses its direction of motion across the sky. Mon, 16 Jan 2040 at 08:17 EDT (5,719 days away) in Virgo

408.

Saturn enters retrograde motion Saturn reverses its direction of motion across the sky. Fri, 20 Jan 2040 at 23:20 EDT (5,724 days away) in Virgo

409.

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, 21 Jan 2040 at 14:38 EDT (5,724 days away) in Cancer

410.

Mars ends retrograde motion Mars returns to its usual eastward motion after opposition. Thu, 09 Feb 2040 at 06:52 EDT (5,743 days away) in Gemini

411.

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. Fri, 16 Mar 2040 at 17:50 EDT (5,779 days away) in Virgo

412.

Jupiter at perigee Jupiter reaches its closest point to the Earth – marking the best time to observe it in 1970. Sat, 17 Mar 2040 at 05:42 EDT (5,780 days away) in Virgo

413.

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. Wed, 28 Mar 2040 at 14:07 EDT (5,791 days away) in Virgo

414.

Uranus ends retrograde motion Uranus returns to its usual eastward motion after opposition. Thu, 05 Apr 2040 at 18:03 EDT (5,799 days away) in Cancer

415.

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. Sun, 22 Apr 2040 at 15:43 EDT (5,816 days away) in Aries

416.

Mars at aphelion Mars passes the furthest point along its orbit from the Sun. Thu, 03 May 2040 at 15:13 EDT (5,827 days away) in Cancer

417.

Jupiter ends retrograde motion Jupiter returns to its usual eastward motion after opposition. Fri, 18 May 2040 at 00:00 EDT (5,842 days away) in Leo

418.

Saturn ends retrograde motion Saturn returns to its usual eastward motion after opposition. Wed, 06 Jun 2040 at 13:57 EDT (5,861 days away) in Virgo

419.

Uranus at solar conjunction Uranus is unobservable as it passes around the far side of the Sun – marking the end of one apparition and the beginning of the next. Wed, 25 Jul 2040 at 21:39 EDT (5,910 days away) in Cancer

420.

Neptune enters retrograde motion Neptune reverses its direction of motion across the sky. Wed, 08 Aug 2040 at 01:33 EDT (5,924 days away) in Aries