Every ingress of the Sun and planets, chronologically, with the exact UTC instant. Retrograde re-entries are marked.
In 1900 the Sun and planets change signs 49 times. Outer-planet ingresses: Saturn enters Capricorn on Jan 21, 1900, 08:08 UTC; Saturn enters Sagittarius on Jul 18, 1900, 17:34 UTC (retrograde re-entry); Saturn enters Capricorn on Oct 17, 1900, 05:01 UTC.
| Instant (UTC) | Planet | From | Into |
|---|---|---|---|
| Jan 9, 1900, 02:10 UTC | ☿ Mercury | Sagittarius | Capricorn |
| Jan 20, 1900, 01:39 UTC | ♀ Venus | Aquarius | Pisces |
| Jan 20, 1900, 11:32 UTC | ☉ Sun | Capricorn | Aquarius |
| Jan 21, 1900, 08:08 UTC | ♄ Saturn | Sagittarius | Capricorn |
| Jan 21, 1900, 18:50 UTC | ♂ Mars | Capricorn | Aquarius |
| Jan 28, 1900, 17:10 UTC | ☿ Mercury | Capricorn | Aquarius |
| Feb 13, 1900, 14:08 UTC | ♀ Venus | Pisces | Aries |
| Feb 15, 1900, 00:05 UTC | ☿ Mercury | Aquarius | Pisces |
| Feb 19, 1900, 02:01 UTC | ☉ Sun | Aquarius | Pisces |
| Feb 28, 1900, 22:16 UTC | ♂ Mars | Aquarius | Pisces |
| Mar 3, 1900, 21:21 UTC | ☿ Mercury | Pisces | Aries |
| Mar 10, 1900, 18:08 UTC | ♀ Venus | Aries | Taurus |
| Mar 21, 1900, 01:39 UTC | ☉ Sun | Pisces | Aries |
| Mar 29, 1900, 23:07 UTC | ☿ Mercury ℞ | Aries | Pisces |
| Apr 6, 1900, 04:15 UTC | ♀ Venus | Taurus | Gemini |
| Apr 8, 1900, 03:58 UTC | ♂ Mars | Pisces | Aries |
| Apr 17, 1900, 01:04 UTC | ☿ Mercury | Pisces | Aries |
| Apr 20, 1900, 13:27 UTC | ☉ Sun | Aries | Taurus |
| May 5, 1900, 15:46 UTC | ♀ Venus | Gemini | Cancer |
| May 11, 1900, 00:14 UTC | ☿ Mercury | Aries | Taurus |
| May 17, 1900, 09:05 UTC | ♂ Mars | Aries | Taurus |
| May 21, 1900, 13:17 UTC | ☉ Sun | Taurus | Gemini |
| May 26, 1900, 10:51 UTC | ☿ Mercury | Taurus | Gemini |
| Jun 9, 1900, 09:23 UTC | ☿ Mercury | Gemini | Cancer |
| Jun 21, 1900, 21:40 UTC | ☉ Sun | Gemini | Cancer |
| Jun 27, 1900, 09:13 UTC | ☿ Mercury | Cancer | Leo |
| Jun 27, 1900, 09:21 UTC | ♂ Mars | Taurus | Gemini |
| Jul 18, 1900, 17:34 UTC | ♄ Saturn ℞ | Capricorn | Sagittarius |
| Jul 23, 1900, 08:36 UTC | ☉ Sun | Cancer | Leo |
| Aug 10, 1900, 01:15 UTC | ♂ Mars | Gemini | Cancer |
| Aug 23, 1900, 15:20 UTC | ☉ Sun | Leo | Virgo |
| Sep 3, 1900, 00:39 UTC | ☿ Mercury | Leo | Virgo |
| Sep 8, 1900, 20:55 UTC | ♀ Venus | Cancer | Leo |
| Sep 18, 1900, 23:18 UTC | ☿ Mercury | Virgo | Libra |
| Sep 23, 1900, 12:20 UTC | ☉ Sun | Virgo | Libra |
| Sep 26, 1900, 18:08 UTC | ♂ Mars | Cancer | Leo |
| Oct 7, 1900, 08:22 UTC | ☿ Mercury | Libra | Scorpio |
| Oct 8, 1900, 13:36 UTC | ♀ Venus | Leo | Virgo |
| Oct 17, 1900, 05:01 UTC | ♄ Saturn | Sagittarius | Capricorn |
| Oct 23, 1900, 20:55 UTC | ☉ Sun | Libra | Scorpio |
| Oct 30, 1900, 06:29 UTC | ☿ Mercury | Scorpio | Sagittarius |
| Nov 3, 1900, 21:33 UTC | ♀ Venus | Virgo | Libra |
| Nov 18, 1900, 20:39 UTC | ☿ Mercury ℞ | Sagittarius | Scorpio |
| Nov 22, 1900, 17:48 UTC | ☉ Sun | Scorpio | Sagittarius |
| Nov 23, 1900, 08:41 UTC | ♂ Mars | Leo | Virgo |
| Nov 28, 1900, 21:55 UTC | ♀ Venus | Libra | Scorpio |
| Dec 12, 1900, 15:03 UTC | ☿ Mercury | Scorpio | Sagittarius |
| Dec 22, 1900, 06:42 UTC | ☉ Sun | Sagittarius | Capricorn |
| Dec 23, 1900, 07:49 UTC | ♀ Venus | Scorpio | Sagittarius |