ChronoWaves
The same Moon worldwide
At the same instant, the lunar phase is essentially the same everywhere on Earth. Its angle in your sky varies with your location and the time of night.
Your Birthday Moon
Discover the Moon that accompanied your arrival: its phase, its light and its place in the lunar cycle.
Your saved birthday loads automatically when available. Choose another date to explore a friend's Moon without changing your saved birthday. We use 12:00 UTC on the selected date for a consistent snapshot; your exact birth time and location can give a different result near a phase change.
Enter your birth date to begin.
Illustrated phase · northern-sky orientation
The Moon on your birthday
Illuminated
Lunar age
Direction
Your card includes the selected birth date. Download it to keep or share yourself.
One Moon, a changing view
What illumination tells you
Illumination is the percentage of the Moon's Earth-facing disc lit by the Sun. Waxing means that fraction is increasing; waning means it is decreasing.
Counting lunar days
Lunar age counts days since the new moon. A complete cycle averages about 29.53 days, so your birthday falls at a different point in the cycle each year.
This tool uses ChronoWaves' approximate mean lunar cycle model. Phase names describe broad portions of the cycle; illumination and lunar age are estimates, especially for dates far from the reference epoch. This is a personal astronomy keepsake, without personality predictions.