Across 1990, the sky delivered 13 full moons and 4 eclipses. The eclipses fell: an annular solar eclipse in Aquarius on January 26, a total lunar eclipse in Leo on February 9, a total solar eclipse in Cancer on July 21, and a partial lunar eclipse in Aquarius on August 6. Mercury turned retrograde three times (Apr 23 to May 16; Aug 25 to Sep 17; Dec 14 onward). The first full moon rose in Cancer on January 10. December saw two full moons, a blue moon. 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 1990
- First Quarter Moon in Aries
- Full Moon in Cancer
- Venus Rx enters Capricorn
- Last Quarter Moon in Libra
- Mercury Direct
- Sun enters Aquarius
- Annular Solar Eclipse (New Moon) in Aquarius
- Vesta enters Pisces
- Mars enters Capricorn
February 1990
- First Quarter Moon in Taurus
- Ceres Direct
- Venus Direct
- Total Lunar Eclipse (Full Moon) in Leo
- Mercury enters Aquarius
- Last Quarter Moon in Scorpio
- Sun enters Pisces
- Pluto Retrograde
- Jupiter Direct
- New Moon in Pisces
March 1990
- Mercury enters Pisces
- Venus enters Aquarius
- First Quarter Moon in Gemini
- Full Moon in Virgo
- Mars enters Aquarius
- Juno Retrograde
- Chiron Direct
- Last Quarter Moon in Sagittarius
- Mercury enters Aries
- Pallas enters Taurus
- Sun enters Aries (Spring Equinox)
- New Moon in Aries
- Vesta enters Aries
April 1990
- Ceres enters Cancer
- First Quarter Moon in Cancer
- Mercury enters Taurus
- Venus enters Pisces
- Full Moon in Libra
- Uranus Retrograde
- Neptune Retrograde
- Last Quarter Moon in Capricorn
- Sun enters Taurus
- Mars enters Pisces
- Mercury Retrograde
- New Moon in Taurus
May 1990
- First Quarter Moon in Leo
- Venus enters Aries
- Saturn Retrograde
- Full Moon in Scorpio
- Mercury Direct
- Last Quarter Moon in Aquarius
- Pallas enters Gemini
- Sun enters Gemini
- New Moon in Gemini
- Venus enters Taurus
- Mars enters Aries
- First Quarter Moon in Virgo
June 1990
- Vesta enters Taurus
- Full Moon in Sagittarius
- Mercury enters Gemini
- Last Quarter Moon in Pisces
- Ceres enters Leo
- Sun enters Cancer (Summer Solstice)
- New Moon in Cancer
- Venus enters Gemini
- Mercury enters Cancer
- First Quarter Moon in Libra
July 1990
- Juno Direct
- Full Moon in Capricorn
- Pallas enters Cancer
- Mercury enters Leo
- Mars enters Taurus
- Last Quarter Moon in Aries
- Venus enters Cancer
- Total Solar Eclipse (New Moon) in Cancer
- Sun enters Leo
- Pluto Direct
- Mercury enters Virgo
- First Quarter Moon in Scorpio
August 1990
- Partial Lunar Eclipse (Full Moon) in Aquarius
- Last Quarter Moon in Taurus
- Venus enters Leo
- Jupiter enters Leo
- New Moon in Leo
- Sun enters Virgo
- Mercury Retrograde
- Ceres enters Virgo
- First Quarter Moon in Sagittarius
- Pallas enters Leo
- Mars enters Gemini
September 1990
- Full Moon in Pisces
- Venus enters Virgo
- Vesta enters Gemini
- Last Quarter Moon in Gemini
- Uranus Direct
- Mercury Direct
- New Moon in Virgo
- Saturn Direct
- Sun enters Libra (Autumn Equinox)
- Neptune Direct
- First Quarter Moon in Capricorn
- Vesta Retrograde
October 1990
- Venus enters Libra
- Full Moon in Aries
- Mercury enters Libra
- Last Quarter Moon in Cancer
- Vesta Rx enters Taurus
- Juno enters Sagittarius
- New Moon in Libra
- Mars Retrograde
- Mercury enters Scorpio
- Pallas enters Virgo
- Sun enters Scorpio
- Venus enters Scorpio
- First Quarter Moon in Aquarius
- Ceres enters Libra
November 1990
- Full Moon in Taurus
- Chiron Retrograde
- Last Quarter Moon in Leo
- Mercury enters Sagittarius
- New Moon in Scorpio
- Venus enters Sagittarius
- True Node Rx enters Capricorn
- Sun enters Sagittarius
- First Quarter Moon in Pisces
- Jupiter Retrograde
December 1990
- Mercury enters Capricorn
- Full Moon in Gemini
- Last Quarter Moon in Virgo
- Venus enters Capricorn
- Mars Rx enters Taurus
- Mercury Retrograde
- New Moon in Sagittarius
- Sun enters Capricorn (Winter Solstice)
- First Quarter Moon in Aries
- Mercury Rx enters Sagittarius
- Full Moon in Cancer