Every ingress of the Sun and planets, chronologically, with the exact UTC instant. Retrograde re-entries are marked.
In 1921 the Sun and planets change signs 48 times. Outer-planet ingresses: Jupiter enters Libra on Sep 25, 1921, 23:10 UTC; Saturn enters Libra on Oct 7, 1921, 17:21 UTC.
| Instant (UTC) | Planet | From | Into |
|---|---|---|---|
| Jan 5, 1921, 07:39 UTC | ♂ Mars | Aquarius | Pisces |
| Jan 6, 1921, 20:32 UTC | ♀ Venus | Aquarius | Pisces |
| Jan 19, 1921, 02:29 UTC | ☿ Mercury | Capricorn | Aquarius |
| Jan 20, 1921, 13:55 UTC | ☉ Sun | Capricorn | Aquarius |
| Feb 2, 1921, 18:35 UTC | ♀ Venus | Pisces | Aries |
| Feb 5, 1921, 10:13 UTC | ☿ Mercury | Aquarius | Pisces |
| Feb 13, 1921, 05:21 UTC | ♂ Mars | Pisces | Aries |
| Feb 19, 1921, 04:20 UTC | ☉ Sun | Aquarius | Pisces |
| Mar 7, 1921, 09:18 UTC | ♀ Venus | Aries | Taurus |
| Mar 21, 1921, 03:51 UTC | ☉ Sun | Pisces | Aries |
| Mar 25, 1921, 06:26 UTC | ♂ Mars | Aries | Taurus |
| Apr 14, 1921, 02:12 UTC | ☿ Mercury | Pisces | Aries |
| Apr 20, 1921, 15:32 UTC | ☉ Sun | Aries | Taurus |
| Apr 25, 1921, 23:46 UTC | ♀ Venus ℞ | Taurus | Aries |
| May 1, 1921, 07:03 UTC | ☿ Mercury | Aries | Taurus |
| May 6, 1921, 01:45 UTC | ♂ Mars | Taurus | Gemini |
| May 15, 1921, 10:09 UTC | ☿ Mercury | Taurus | Gemini |
| May 21, 1921, 15:17 UTC | ☉ Sun | Taurus | Gemini |
| May 31, 1921, 05:12 UTC | ☿ Mercury | Gemini | Cancer |
| Jun 2, 1921, 04:21 UTC | ♀ Venus | Aries | Taurus |
| Jun 18, 1921, 20:34 UTC | ♂ Mars | Gemini | Cancer |
| Jun 21, 1921, 23:36 UTC | ☉ Sun | Gemini | Cancer |
| Jul 8, 1921, 05:57 UTC | ♀ Venus | Taurus | Gemini |
| Jul 23, 1921, 10:30 UTC | ☉ Sun | Cancer | Leo |
| Aug 3, 1921, 11:01 UTC | ♂ Mars | Cancer | Leo |
| Aug 5, 1921, 14:42 UTC | ♀ Venus | Gemini | Cancer |
| Aug 8, 1921, 07:42 UTC | ☿ Mercury | Cancer | Leo |
| Aug 23, 1921, 13:54 UTC | ☿ Mercury | Leo | Virgo |
| Aug 23, 1921, 17:15 UTC | ☉ Sun | Leo | Virgo |
| Aug 31, 1921, 22:23 UTC | ♀ Venus | Cancer | Leo |
| Sep 9, 1921, 02:37 UTC | ☿ Mercury | Virgo | Libra |
| Sep 19, 1921, 11:40 UTC | ♂ Mars | Leo | Virgo |
| Sep 23, 1921, 14:20 UTC | ☉ Sun | Virgo | Libra |
| Sep 25, 1921, 23:10 UTC | ♃ Jupiter | Virgo | Libra |
| Sep 26, 1921, 04:09 UTC | ♀ Venus | Leo | Virgo |
| Sep 29, 1921, 16:02 UTC | ☿ Mercury | Libra | Scorpio |
| Oct 7, 1921, 17:21 UTC | ♄ Saturn | Virgo | Libra |
| Oct 20, 1921, 17:35 UTC | ♀ Venus | Virgo | Libra |
| Oct 23, 1921, 23:02 UTC | ☉ Sun | Libra | Scorpio |
| Nov 6, 1921, 16:13 UTC | ♂ Mars | Virgo | Libra |
| Nov 13, 1921, 21:11 UTC | ♀ Venus | Libra | Scorpio |
| Nov 22, 1921, 20:05 UTC | ☉ Sun | Scorpio | Sagittarius |
| Dec 5, 1921, 00:28 UTC | ☿ Mercury | Scorpio | Sagittarius |
| Dec 7, 1921, 19:47 UTC | ♀ Venus | Scorpio | Sagittarius |
| Dec 22, 1921, 09:07 UTC | ☉ Sun | Sagittarius | Capricorn |
| Dec 24, 1921, 06:45 UTC | ☿ Mercury | Sagittarius | Capricorn |
| Dec 26, 1921, 11:48 UTC | ♂ Mars | Libra | Scorpio |
| Dec 31, 1921, 16:31 UTC | ♀ Venus | Sagittarius | Capricorn |