161.

Neptune enters retrograde motion Neptune reverses its direction of motion across the sky. Mon, 31 May 2010 at 13:52 EDT (5,090 days ago) in Aquarius

162.

Saturn ends retrograde motion Saturn returns to its usual eastward motion after opposition. Sun, 30 May 2010 at 14:34 EDT (5,091 days ago) in Virgo

163.

Mars at aphelion Mars passes the furthest point along its orbit from the Sun. Tue, 30 Mar 2010 at 18:23 EDT (5,152 days ago) in Cancer

164.

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. Sun, 21 Mar 2010 at 20:29 EDT (5,161 days ago) in Virgo

165.

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, 17 Mar 2010 at 02:40 EDT (5,165 days ago) in Pisces

166.

Mars ends retrograde motion Mars returns to its usual eastward motion after opposition. Wed, 10 Mar 2010 at 12:08 EDT (5,172 days ago) in Cancer

167.

Jupiter at apogee Jupiter reaches its furthest point from the Earth, as it passes around the far side of the Sun. Sun, 28 Feb 2010 at 08:55 EDT (5,182 days ago) in Aquarius

168.

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. Sun, 28 Feb 2010 at 05:33 EDT (5,182 days ago) in Aquarius

169.

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, 14 Feb 2010 at 18:10 EDT (5,196 days ago) in Capricornus

170.

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. Fri, 29 Jan 2010 at 14:37 EDT (5,212 days ago) in Cancer

171.

Mars at perigee Mars reaches its closest point to the Earth – marking the best time to observe it in 1970. Wed, 27 Jan 2010 at 13:55 EDT (5,214 days ago) in Cancer

172.

Saturn enters retrograde motion Saturn reverses its direction of motion across the sky. Wed, 13 Jan 2010 at 10:29 EDT (5,228 days ago) in Virgo

173.

Mars enters retrograde motion Mars reverses its direction of motion across the sky. Sun, 20 Dec 2009 at 08:25 EDT (5,252 days ago) in Leo

174.

Uranus ends retrograde motion Uranus returns to its usual eastward motion after opposition. Tue, 01 Dec 2009 at 16:36 EDT (5,271 days ago) in Aquarius

175.

Neptune ends retrograde motion Neptune returns to its usual eastward motion after opposition. Wed, 04 Nov 2009 at 14:31 EDT (5,298 days ago) in Capricornus

176.

Jupiter ends retrograde motion Jupiter returns to its usual eastward motion after opposition. Tue, 13 Oct 2009 at 00:31 EDT (5,320 days ago) in Capricornus

177.

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. Thu, 17 Sep 2009 at 14:12 EDT (5,346 days ago) in Virgo

178.

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, 17 Sep 2009 at 05:33 EDT (5,346 days ago) in Pisces

179.

Saturn ring plane crossing Saturn's seasons are changing, making its rings appear edge-on from the Earth. Fri, 04 Sep 2009 at 07:40 EDT (5,359 days ago) in Virgo

180.

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, 17 Aug 2009 at 16:46 EDT (5,377 days ago) in Capricornus