Every ingress of the Sun and planets, chronologically, with the exact UTC instant. Retrograde re-entries are marked.
In 1991 the Sun and planets change signs 48 times. Outer-planet ingresses: Saturn enters Aquarius on Feb 6, 1991, 18:51 UTC; Jupiter enters Virgo on Sep 12, 1991, 06:00 UTC.
| Instant (UTC) | Planet | From | Into |
|---|---|---|---|
| Jan 5, 1991, 05:03 UTC | ♀ Venus | Capricorn | Aquarius |
| Jan 14, 1991, 08:01 UTC | ☿ Mercury | Sagittarius | Capricorn |
| Jan 20, 1991, 13:47 UTC | ☉ Sun | Capricorn | Aquarius |
| Jan 21, 1991, 01:16 UTC | ♂ Mars | Taurus | Gemini |
| Jan 29, 1991, 04:44 UTC | ♀ Venus | Aquarius | Pisces |
| Feb 5, 1991, 22:21 UTC | ☿ Mercury | Capricorn | Aquarius |
| Feb 6, 1991, 18:51 UTC | ♄ Saturn | Capricorn | Aquarius |
| Feb 19, 1991, 03:58 UTC | ☉ Sun | Aquarius | Pisces |
| Feb 22, 1991, 09:02 UTC | ♀ Venus | Pisces | Aries |
| Feb 24, 1991, 02:35 UTC | ☿ Mercury | Aquarius | Pisces |
| Mar 11, 1991, 22:39 UTC | ☿ Mercury | Pisces | Aries |
| Mar 18, 1991, 21:45 UTC | ♀ Venus | Aries | Taurus |
| Mar 21, 1991, 03:02 UTC | ☉ Sun | Pisces | Aries |
| Apr 3, 1991, 00:49 UTC | ♂ Mars | Gemini | Cancer |
| Apr 13, 1991, 00:10 UTC | ♀ Venus | Taurus | Gemini |
| Apr 20, 1991, 14:08 UTC | ☉ Sun | Aries | Taurus |
| May 9, 1991, 01:28 UTC | ♀ Venus | Gemini | Cancer |
| May 16, 1991, 22:45 UTC | ☿ Mercury | Aries | Taurus |
| May 21, 1991, 13:21 UTC | ☉ Sun | Taurus | Gemini |
| May 26, 1991, 12:19 UTC | ♂ Mars | Cancer | Leo |
| Jun 5, 1991, 02:24 UTC | ☿ Mercury | Taurus | Gemini |
| Jun 6, 1991, 01:16 UTC | ♀ Venus | Cancer | Leo |
| Jun 19, 1991, 05:40 UTC | ☿ Mercury | Gemini | Cancer |
| Jun 21, 1991, 21:19 UTC | ☉ Sun | Gemini | Cancer |
| Jul 4, 1991, 06:05 UTC | ☿ Mercury | Cancer | Leo |
| Jul 11, 1991, 05:06 UTC | ♀ Venus | Leo | Virgo |
| Jul 15, 1991, 12:36 UTC | ♂ Mars | Leo | Virgo |
| Jul 23, 1991, 08:11 UTC | ☉ Sun | Cancer | Leo |
| Jul 26, 1991, 12:59 UTC | ☿ Mercury | Leo | Virgo |
| Aug 19, 1991, 21:40 UTC | ☿ Mercury ℞ | Virgo | Leo |
| Aug 21, 1991, 15:06 UTC | ♀ Venus ℞ | Virgo | Leo |
| Aug 23, 1991, 15:13 UTC | ☉ Sun | Leo | Virgo |
| Sep 1, 1991, 06:38 UTC | ♂ Mars | Virgo | Libra |
| Sep 10, 1991, 17:14 UTC | ☿ Mercury | Leo | Virgo |
| Sep 12, 1991, 06:00 UTC | ♃ Jupiter | Leo | Virgo |
| Sep 23, 1991, 12:48 UTC | ☉ Sun | Virgo | Libra |
| Sep 28, 1991, 03:26 UTC | ☿ Mercury | Virgo | Libra |
| Oct 6, 1991, 21:15 UTC | ♀ Venus | Leo | Virgo |
| Oct 15, 1991, 14:01 UTC | ☿ Mercury | Libra | Scorpio |
| Oct 16, 1991, 19:04 UTC | ♂ Mars | Libra | Scorpio |
| Oct 23, 1991, 22:05 UTC | ☉ Sun | Libra | Scorpio |
| Nov 4, 1991, 10:41 UTC | ☿ Mercury | Scorpio | Sagittarius |
| Nov 9, 1991, 06:36 UTC | ♀ Venus | Virgo | Libra |
| Nov 22, 1991, 19:36 UTC | ☉ Sun | Scorpio | Sagittarius |
| Nov 29, 1991, 02:19 UTC | ♂ Mars | Scorpio | Sagittarius |
| Dec 6, 1991, 07:21 UTC | ♀ Venus | Libra | Scorpio |
| Dec 22, 1991, 08:53 UTC | ☉ Sun | Sagittarius | Capricorn |
| Dec 31, 1991, 15:19 UTC | ♀ Venus | Scorpio | Sagittarius |