Moon Sign Calculator
Find your Moon sign from your birth date, time and place, with its exact degree, the Moon phase and how much of it was lit. Unknown birth time? See both possible signs.
Tropical zodiac; Moon from Meeus, Astronomical Algorithms ch. 47 (apparent position, within about 20″).
In astrology the Moon sign describes your emotional style — what comforts you and how you react — as the Sun sign describes your outward character. The Moon crosses a sign in about two and a half days, so the date alone is often not enough: this calculator uses your birth time and place to find the Moon's exact position, its phase and how much of it was lit. If you do not know your birth time, it shows the signs at the start and end of the day.
How to use this tool
- Enter your birth date and, if you know it, the local birth time.
- Choose the birth city or enter coordinates and time zone.
- Read your Moon sign with its degree, the phase and the illumination. Without a time, check whether one or two signs are possible.
Formula
λ☾ = L′ + Σℓ ÷ 1,000,000 (+ nutation)
L′ is the Moon's mean longitude and Σℓ the sum of 60 periodic terms in the mean elongation D, the Sun's and Moon's anomalies M and M′, and the argument of latitude F (Meeus, Astronomical Algorithms, chapter 47). The phase follows from the Moon's angle ahead of the Sun: 0° new, 90° first quarter, 180° full.
Example
For 12 April 1992 at 00:00 UTC the Moon stood at 133.18° ecliptic longitude — 13°10′ into Leo — and was about 68% illuminated, a waxing Moon just past first quarter. Over that day it moved on to about Leo 26°, so anyone born that day has a Leo Moon.
Frequently asked questions
How accurate is the Moon sign?
Checked against a full ephemeris, the position is within about 20 arcseconds, far finer than a sign. The real uncertainty is usually the birth time: the Moon moves about half a degree an hour.
What if my birth time is unknown?
Tick the box. If the Moon stayed in one sign all day, you have your answer; if it changed sign, the tool shows the time of the change so you can judge which side your birth was likely on.
Is this the same as the Vedic Moon sign (Rashi)?
No. This is the tropical (Western) Moon sign. The Vedic rashi uses the sidereal zodiac and is usually one sign earlier — see the Kundli calculator.
Astrology is presented for entertainment and self-reflection only. The Moon's position and phase are real astronomy, but the astrological meaning of a Moon sign has no scientific basis; nothing here is health, financial, legal or relationship advice. How we check our calculators · Full disclaimer
Last updated:
Page address with these inputs: https://kakao.mobile/tools/moon-sign-calculator/
Cite or embed this tool
kakaoCalc. (2026, November 8). Moon Sign Calculator. https://kakao.mobile/tools/moon-sign-calculator/
“Moon Sign Calculator.” kakaoCalc, 8 Nov. 2026, kakao.mobile/tools/moon-sign-calculator/.
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