Every ingress of the Sun and planets, chronologically, with the exact UTC instant. Retrograde re-entries are marked.
In 1981 the Sun and planets change signs 56 times. Outer-planet ingresses: Uranus enters Sagittarius on Feb 17, 1981, 08:59 UTC; Uranus enters Scorpio on Mar 20, 1981, 23:18 UTC (retrograde re-entry); Uranus enters Sagittarius on Nov 16, 1981, 12:04 UTC; Jupiter enters Scorpio on Nov 27, 1981, 02:18 UTC.
| Instant (UTC) | Planet | From | Into |
|---|---|---|---|
| Jan 11, 1981, 06:48 UTC | ♀ Venus | Sagittarius | Capricorn |
| Jan 12, 1981, 15:47 UTC | ☿ Mercury | Capricorn | Aquarius |
| Jan 20, 1981, 03:36 UTC | ☉ Sun | Capricorn | Aquarius |
| Jan 31, 1981, 17:35 UTC | ☿ Mercury | Aquarius | Pisces |
| Feb 4, 1981, 06:07 UTC | ♀ Venus | Capricorn | Aquarius |
| Feb 6, 1981, 22:49 UTC | ♂ Mars | Aquarius | Pisces |
| Feb 16, 1981, 08:02 UTC | ☿ Mercury ℞ | Pisces | Aquarius |
| Feb 17, 1981, 08:59 UTC | ♅ Uranus | Scorpio | Sagittarius |
| Feb 18, 1981, 17:52 UTC | ☉ Sun | Aquarius | Pisces |
| Feb 28, 1981, 06:02 UTC | ♀ Venus | Aquarius | Pisces |
| Mar 17, 1981, 02:39 UTC | ♂ Mars | Pisces | Aries |
| Mar 18, 1981, 04:32 UTC | ☿ Mercury | Aquarius | Pisces |
| Mar 20, 1981, 17:03 UTC | ☉ Sun | Pisces | Aries |
| Mar 20, 1981, 23:18 UTC | ♅ Uranus ℞ | Sagittarius | Scorpio |
| Mar 24, 1981, 07:43 UTC | ♀ Venus | Pisces | Aries |
| Apr 8, 1981, 09:11 UTC | ☿ Mercury | Pisces | Aries |
| Apr 17, 1981, 12:08 UTC | ♀ Venus | Aries | Taurus |
| Apr 20, 1981, 04:18 UTC | ☉ Sun | Aries | Taurus |
| Apr 24, 1981, 05:31 UTC | ☿ Mercury | Aries | Taurus |
| Apr 25, 1981, 07:16 UTC | ♂ Mars | Aries | Taurus |
| May 8, 1981, 09:43 UTC | ☿ Mercury | Taurus | Gemini |
| May 11, 1981, 19:44 UTC | ♀ Venus | Taurus | Gemini |
| May 21, 1981, 03:40 UTC | ☉ Sun | Taurus | Gemini |
| May 28, 1981, 17:04 UTC | ☿ Mercury | Gemini | Cancer |
| Jun 5, 1981, 05:27 UTC | ♂ Mars | Taurus | Gemini |
| Jun 5, 1981, 06:29 UTC | ♀ Venus | Gemini | Cancer |
| Jun 21, 1981, 11:45 UTC | ☉ Sun | Gemini | Cancer |
| Jun 22, 1981, 22:51 UTC | ☿ Mercury ℞ | Cancer | Gemini |
| Jun 29, 1981, 20:20 UTC | ♀ Venus | Cancer | Leo |
| Jul 12, 1981, 21:08 UTC | ☿ Mercury | Gemini | Cancer |
| Jul 18, 1981, 08:54 UTC | ♂ Mars | Gemini | Cancer |
| Jul 22, 1981, 22:39 UTC | ☉ Sun | Cancer | Leo |
| Jul 24, 1981, 14:04 UTC | ♀ Venus | Leo | Virgo |
| Aug 1, 1981, 18:31 UTC | ☿ Mercury | Cancer | Leo |
| Aug 16, 1981, 12:47 UTC | ☿ Mercury | Leo | Virgo |
| Aug 18, 1981, 13:44 UTC | ♀ Venus | Virgo | Libra |
| Aug 23, 1981, 05:38 UTC | ☉ Sun | Leo | Virgo |
| Sep 2, 1981, 01:51 UTC | ♂ Mars | Cancer | Leo |
| Sep 2, 1981, 22:40 UTC | ☿ Mercury | Virgo | Libra |
| Sep 12, 1981, 22:51 UTC | ♀ Venus | Libra | Scorpio |
| Sep 23, 1981, 03:05 UTC | ☉ Sun | Virgo | Libra |
| Sep 27, 1981, 11:02 UTC | ☿ Mercury | Libra | Scorpio |
| Oct 9, 1981, 00:04 UTC | ♀ Venus | Scorpio | Sagittarius |
| Oct 14, 1981, 02:08 UTC | ☿ Mercury ℞ | Scorpio | Libra |
| Oct 21, 1981, 01:56 UTC | ♂ Mars | Leo | Virgo |
| Oct 23, 1981, 12:13 UTC | ☉ Sun | Libra | Scorpio |
| Nov 5, 1981, 12:40 UTC | ♀ Venus | Sagittarius | Capricorn |
| Nov 9, 1981, 13:14 UTC | ☿ Mercury | Libra | Scorpio |
| Nov 16, 1981, 12:04 UTC | ♅ Uranus | Scorpio | Sagittarius |
| Nov 22, 1981, 09:36 UTC | ☉ Sun | Scorpio | Sagittarius |
| Nov 27, 1981, 02:18 UTC | ♃ Jupiter | Libra | Scorpio |
| Nov 28, 1981, 20:52 UTC | ☿ Mercury | Scorpio | Sagittarius |
| Dec 8, 1981, 20:53 UTC | ♀ Venus | Capricorn | Aquarius |
| Dec 16, 1981, 00:14 UTC | ♂ Mars | Virgo | Libra |
| Dec 17, 1981, 22:21 UTC | ☿ Mercury | Sagittarius | Capricorn |
| Dec 21, 1981, 22:51 UTC | ☉ Sun | Sagittarius | Capricorn |