ChronoWaves
Begin at Aries zero
The tropical zodiac starts at 0° Aries, the direction of the March equinox.
Moon Through the Zodiac
Follow the Moon's calculated geocentric longitude as it moves through the twelve equal sectors of the tropical zodiac.
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Aquarius
21.7° into sign
Monday, 14 December 2026
Moon in Aquarius
The Moon's calculated geocentric longitude places it in the Aquarius sector of the tropical zodiac.
- Longitude
- 321.7°
- Within sign
- 21.7°
- Moon phase
- 🌒 Waxing Crescent
- Illuminated
- 26.2%
- Traditional element
- Air
- Traditional quality
- Fixed
Coordinate system: geocentric tropical ecliptic of date. Positions are calculated estimates intended for general sky tracking.
The simple version
How does the Moon get a zodiac sign?
Imagine standing at the centre of Earth and drawing a straight line towards the Moon. Where that line points on the zodiac circle supplies the Moon's sign and degree.
321.7° = Aquarius 21.7°
Measure around the ecliptic
The red line is the Moon's geocentric longitude: 321.7° on this date.
Find the 30-degree sector
Aquarius begins at 300°. The Moon's longitude falls inside that sector.
Count within the sign
321.7° minus 300° gives 21.7° into Aquarius.
The key idea: the zodiac sign describes the Moon's direction from Earth. It does not mean the Moon has entered a physical ring or moved close to those stars.
The Moon's two-week journey
The Moon normally crosses a zodiac sector in roughly two to three days, though its changing orbital speed means the interval is not perfectly uniform.
Upcoming sign crossings
Transition times are refined from the calculated lunar longitude and shown in UTC.
Aquarius to Pisces
Pisces to Aries
Aries to Taurus
Taurus to Gemini
Gemini to Cancer
What this tracker measures
A real Moon coordinate
This tracker calculates the Moon's geocentric ecliptic longitude from lunar orbital elements and the main periodic perturbations. The result changes with the Moon's motion, not with the month printed on a calendar.
Tropical signs are equal sectors
The tropical zodiac divides the ecliptic into twelve equal 30-degree sectors beginning at the March equinox. These familiar signs are a coordinate convention; the official astronomical constellations have unequal boundaries and are not identical to these sectors.
Geocentric versus what you see
Geocentric means the position is calculated from Earth's centre. A nearby object such as the Moon can appear slightly displaced from a particular place on Earth's surface because of parallax.
Coordinate background: NASA's ecliptic definition, the U.S. Naval Observatory glossary, and JPL Horizons documentation.