Moonphase 月相記
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Moon Phase Calculator: the moon you were born under

Which moon was hanging over the day you were born? Enter your birthday to see the phase, how lit it was, and a one-line personality sketch for that phase.

Date of birth

Computed in your browser only. Nothing is uploaded or stored

Two-person version: do your birth moons make a full moon? →

How it works

  1. The moon runs a 29.53-day cycle, from New Moon to Full and back.
  2. Your birth date (taken at noon UTC) is mapped onto that cycle to pick one of the 8 phases.
  3. On boundary days the label can shift by one step, since birth time and timezone move the edge slightly. Most dates are unambiguous.

The 8 birth moon phases, 8 kinds of people

  • New MoonYou start things in the dark. Nothing is shown until it has a shape.
  • Waxing CrescentYou lean forward. Small stubborn steps in a direction you have not named yet.
  • First QuarterYou grow by deciding. Friction does not stop you, it shows you where the edge is.
  • Waxing GibbousYou are the polishing kind. Near the finish is exactly where you slow down and get it right.
  • Full MoonYou feel in full. What others dim, you let shine, sometimes brighter than you can hold.
  • Waning GibbousYou hand things on. Harvest is not an ending to you, it is a gift.
  • Last QuarterYou are good at closing. Letting go is not loss, it is maintenance.
  • Waning CrescentYou carry endings well. Quiet, unhurried, already listening for the next dark.

FAQ

How do I find what moon phase I was born under?

Enter your date of birth above. The tool maps your birthday onto the standard 29.53-day lunar cycle and shows the phase instantly, entirely in your browser.

Do my birth time and place change the result?

For most dates, no. Only when your birthday falls right on a phase boundary can the hour and timezone shift the label by one step. We use noon UTC of your birth date as a stable estimate.

What does my birth moon phase say about me?

The one-liner here is a mirror, not a prophecy. For the fuller portrait, the 30-question test maps you to one of 16 moon-phase types.

What are the moon phases?

The usual eight: New Moon, Waxing Crescent, First Quarter, Waxing Gibbous, Full Moon, Waning Gibbous, Last Quarter and Waning Crescent, cycling every 29.53 days.

A mirror, not a prophecy. It reflects you as you are right now. How you walk is still yours to choose.