When Was Neptune Last in Aquarius?
Updated October 5, 2026
As of October 2026, the last time was 1998–2012: Neptune first entered Aquarius on 29 January 1998 and, because retrograde motion carried it back and forth across the sign's boundary, entered it three times in all before leaving for good on 3 February 2012. Next: Neptune first enters Aquarius on 21 March 2161; retrograde motion carries it back and forth across the sign's boundary, so it enters four times in all and leaves for good on 20 January 2176.
Each bar runs from first entry to final exit. Stretches marked with a neighbouring sign are times it crossed back over the boundary before returning.
Every Neptune-in-Aquarius pass, 1600–2600
Dates are in UTC and the Gregorian calendar; in a time zone far from Greenwich an ingress can fall on the neighbouring calendar day. Dates before 14 September 1752 are Gregorian too, though Britain and its colonies still used the Julian calendar, 10 days behind until 11 March 1700 and 11 days behind after, and began the year on 25 March.
| First entry | Final exit | Time in Aquarius | Entered |
|---|---|---|---|
| 1 March 1670 | 1 January 1685 | 14 years | 3 times |
| In Aquarius: 1 Mar 1670 – 8 Jul 1670 · 1 Jan 1671 – 3 Mar 1684 · 14 Sept 1684 – 1 Jan 1685 | |||
| 13 February 1834 | 6 December 1848 | 14 years | 4 times |
| In Aquarius: 13 Feb 1834 – 31 Jul 1834 · 17 Dec 1834 – 25 Apr 1847 · 12 Jul 1847 – 17 Feb 1848 · 16 Oct 1848 – 6 Dec 1848 | |||
| 29 January 1998 | 3 February 2012 | 13 years | 3 times |
| In Aquarius: 29 Jan 1998 – 23 Aug 1998 · 27 Nov 1998 – 4 Apr 2011 · 5 Aug 2011 – 3 Feb 2012 | |||
| 21 March 2161 | 20 January 2176 | 14 years | 4 times |
| In Aquarius: 21 Mar 2161 – 13 Jun 2161 · 16 Jan 2162 – 21 Sept 2162 · 31 Oct 2162 – 19 Mar 2175 · 24 Aug 2175 – 20 Jan 2176 | |||
| 4 March 2325 | 7 January 2340 | 14 years | 3 times |
| In Aquarius: 4 Mar 2325 – 6 Jul 2325 · 4 Jan 2326 – 8 Mar 2339 · 11 Sept 2339 – 7 Jan 2340 | |||
| 16 February 2489 | 21 December 2503 | 14 years | 4 times |
| In Aquarius: 16 Feb 2489 – 22 Jul 2489 · 21 Dec 2489 – 12 May 2502 · 23 Jun 2502 – 24 Feb 2503 · 30 Sept 2503 – 21 Dec 2503 | |||
Search Neptune in Aquarius in the app
Born with Neptune in Aquarius
- Born 29 January 1998 – 3 February 2012, except 23 August 1998 – 27 November 1998 (in Capricorn) and 4 April 2011 – 5 August 2011 (in Pisces)
On the days Neptune changes sign, the birth time decides: dates here are UTC. Enter your birth data to see your own chart.
Neptune retrograde in Aquarius, the 1998–2012 pass
Retrograde periods with at least one station in Aquarius: the date Neptune stood still and turned retrograde, and the date it turned direct again.
| Stations retrograde | Stations direct |
|---|---|
| 4 May 1998 2°09′ Aquarius | 11 October 1998 29°23′ Capricorn |
| 7 May 1999 4°22′ Aquarius | 14 October 1999 1°35′ Aquarius |
| 8 May 2000 6°34′ Aquarius | 15 October 2000 3°47′ Aquarius |
| 11 May 2001 8°46′ Aquarius | 18 October 2001 5°59′ Aquarius |
| 13 May 2002 10°59′ Aquarius | 20 October 2002 8°11′ Aquarius |
| 16 May 2003 13°11′ Aquarius | 23 October 2003 10°24′ Aquarius |
| 17 May 2004 15°23′ Aquarius | 24 October 2004 12°36′ Aquarius |
| 20 May 2005 17°36′ Aquarius | 26 October 2005 14°49′ Aquarius |
| 22 May 2006 19°49′ Aquarius | 29 October 2006 17°02′ Aquarius |
| 25 May 2007 22°02′ Aquarius | 31 October 2007 19°15′ Aquarius |
| 26 May 2008 24°15′ Aquarius | 2 November 2008 21°28′ Aquarius |
| 29 May 2009 26°28′ Aquarius | 4 November 2009 23°41′ Aquarius |
| 31 May 2010 28°42′ Aquarius | 7 November 2010 25°55′ Aquarius |
| 3 June 2011 0°55′ Pisces | 9 November 2011 28°08′ Aquarius |
How Neptune moves through the zodiac
Across 1600–2600, Neptune spent about 13 years to 14 years in a sign on each pass, not counting retrograde dips out of it, and it returned to the same sign about every 164 years. 100% of passes included at least one retrograde dip back over a sign boundary.
Neptune in other signs
Aries · Taurus · Gemini · Cancer · Leo · Virgo · Libra · Scorpio · Sagittarius · Capricorn · Aquarius · Pisces
Other planets in Aquarius
Venus · Mars · Jupiter · Saturn · Chiron · Uranus · Neptune · Pluto
All planets in all signs · How to read these dates
How these dates were found
With Horoskopos's sky search: Neptune's geocentric, apparent, tropical ecliptic longitude, computed with the open-source Astronomy Engine library, with each sign boundary found to the minute. Sample ingresses agree with NASA JPL's Horizons ephemeris to within about three hours. Data generated 2026-10-04; page built 2026-10-05.