1991 had 12 full moons and 6 eclipses. The eclipses fell: an annular solar eclipse in Capricorn on January 15, a penumbral lunar eclipse in Leo on January 30, a penumbral lunar eclipse in Capricorn on June 26, a total solar eclipse in Cancer on July 11, a penumbral lunar eclipse in Aquarius on July 26, and a partial lunar eclipse in Gemini on December 21. Mercury turned retrograde three times (Apr 4 to Apr 28; Aug 7 to Aug 31; Nov 28 to Dec 18). The first full moon rose in Leo on January 30. Every full moon, new moon, solar and lunar eclipse, equinox, solstice, planetary ingress, and retrograde station below is computed to the millisecond with the NASA-cross-checked Swiss Ephemeris engine and shown in Eastern Time - Choose your location on the page for your own sky.
January 1991
- Mars Direct
- Vesta Direct
- Mercury Direct
- Venus enters Aquarius
- Last Quarter Moon in Libra
- Juno enters Capricorn
- Mercury enters Capricorn
- Annular Solar Eclipse (New Moon) in Capricorn
- Pallas Retrograde
- Sun enters Aquarius
- Mars enters Gemini
- First Quarter Moon in Taurus
- Ceres enters Scorpio
- Venus enters Pisces
- Penumbral Lunar Eclipse (Full Moon) in Leo
February 1991
- Mercury enters Aquarius
- Last Quarter Moon in Scorpio
- Saturn enters Aquarius
- New Moon in Aquarius
- Sun enters Pisces
- First Quarter Moon in Gemini
- Pluto Retrograde
- Venus enters Aries
- Mercury enters Pisces
- Full Moon in Virgo
March 1991
- Ceres Retrograde
- Last Quarter Moon in Sagittarius
- Mercury enters Aries
- Vesta enters Gemini
- New Moon in Pisces
- Venus enters Taurus
- Sun enters Aries (Spring Equinox)
- First Quarter Moon in Cancer
- Chiron Direct
- Full Moon in Libra
- Jupiter Direct
April 1991
- Mars enters Cancer
- Mercury Retrograde
- Ceres Rx enters Libra
- Last Quarter Moon in Capricorn
- Venus enters Gemini
- New Moon in Aries
- Uranus Retrograde
- Neptune Retrograde
- Sun enters Taurus
- First Quarter Moon in Leo
- Pallas Direct
- Mercury Direct
- Full Moon in Scorpio
May 1991
- Juno enters Aquarius
- Last Quarter Moon in Aquarius
- Venus enters Cancer
- New Moon in Taurus
- Mercury enters Taurus
- Saturn Retrograde
- First Quarter Moon in Leo
- Sun enters Gemini
- Juno Retrograde
- Mars enters Leo
- Full Moon in Sagittarius
- Vesta enters Cancer
June 1991
- Ceres Direct
- Mercury enters Gemini
- Last Quarter Moon in Pisces
- Venus enters Leo
- New Moon in Gemini
- Juno Rx enters Capricorn
- First Quarter Moon in Virgo
- Mercury enters Cancer
- Sun enters Cancer (Summer Solstice)
- Penumbral Lunar Eclipse (Full Moon) in Capricorn
July 1991
- Mercury enters Leo
- Last Quarter Moon in Aries
- Venus enters Virgo
- Total Solar Eclipse (New Moon) in Cancer
- Mars enters Virgo
- First Quarter Moon in Libra
- Chiron enters Leo
- Sun enters Leo
- Mercury enters Virgo
- Penumbral Lunar Eclipse (Full Moon) in Aquarius
- Pallas enters Libra
- Pluto Direct
August 1991
- Venus Retrograde
- Ceres enters Scorpio
- Last Quarter Moon in Taurus
- Mercury Retrograde
- Vesta enters Leo
- New Moon in Leo
- First Quarter Moon in Scorpio
- Mercury Rx enters Leo
- Venus Rx enters Leo
- Sun enters Virgo
- Full Moon in Pisces
- Mercury Direct
September 1991
- Mars enters Libra
- Last Quarter Moon in Gemini
- New Moon in Virgo
- Juno Direct
- Mercury enters Virgo
- Jupiter enters Virgo
- Venus Direct
- First Quarter Moon in Sagittarius
- Uranus Direct
- Sun enters Libra (Autumn Equinox)
- Full Moon in Aries
- Neptune Direct
- Mercury enters Libra
- Last Quarter Moon in Cancer
October 1991
- Saturn Direct
- Venus enters Virgo
- New Moon in Libra
- Pallas enters Scorpio
- Mercury enters Scorpio
- First Quarter Moon in Capricorn
- Mars enters Scorpio
- Vesta enters Virgo
- Full Moon in Aries
- Sun enters Scorpio
- Ceres enters Sagittarius
- Last Quarter Moon in Leo
November 1991
- Mercury enters Sagittarius
- New Moon in Scorpio
- Venus enters Libra
- First Quarter Moon in Aquarius
- Juno enters Aquarius
- Full Moon in Taurus
- Chiron Retrograde
- Sun enters Sagittarius
- Last Quarter Moon in Virgo
- Mercury Retrograde
- Mars enters Sagittarius
December 1991
- New Moon in Sagittarius
- Venus enters Scorpio
- First Quarter Moon in Pisces
- Pallas enters Sagittarius
- Mercury Direct
- Partial Lunar Eclipse (Full Moon) in Gemini
- Sun enters Capricorn (Winter Solstice)
- Last Quarter Moon in Libra
- Jupiter Retrograde
- Venus enters Sagittarius