Enter your birth date: over the next 90 days, the nights when the Moon returns to the phase you were born under and the day the Sun comes back to where it stood are drawn on one line with the sky’s great nights.
Your birth details
The sky over the next 90 days
Days shown in this time zone: Eastern Time.
- Mercury turns retrogradeMercury stands still in the sky and seems to move backwards for a few weeks.
- Full moonThe Moon is up all night, straight across from the Sun.
- New moonThe Moon is out of sight; the cycle starts again.
- Mercury turns directMercury stands still again and resumes its usual direction in the sky.
- Leonid meteor showerPeak night: look after midnight, away from city lights.
- Full moonThe Moon is up all night, straight across from the Sun.
- New moonThe Moon is out of sight; the cycle starts again.
- Geminid meteor showerPeak night: look after midnight, away from city lights.
- Winter solsticeThe Sun’s path across the sky changes direction; the season turns.
- Full moonThe Moon is up all night, straight across from the Sun.
- Quadrantid meteor showerPeak night: look after midnight, away from city lights.
- New moonThe Moon is out of sight; the cycle starts again.
Subscribe in your calendar
New moons, full moons and supermoons, meteor showers, solstices and Mercury’s stations for the next 12 months, in your phone’s calendar; it updates on its own. No personal data: everyone gets the same calendar.
iPhone, iPad, Mac and Outlook open the link directly.
Google Calendar opens on a computer: + next to “Other calendars” → “From URL” → paste the address below. It then shows up on your phone.
- Calendar address
https://cloudomen.com/en/moon-phase-calendar/calendar.ics
Android: the Google Calendar app can’t subscribe by address itself; add it once from a computer, or download the file (it is added once and does not update).
How we calculate
A lunar birthday is the night the Moon returns to the angle with the Sun it had when you were born; that happens about every 29.5 days. We work out your birth phase with Jean Meeus’s lunar formulas and find the moments in the next 90 days when the same phase comes back.
Your solar return is the moment the Sun comes back to the longitude it held at your birth; it falls near your birthday, but not at the same hour each year. Without a birth time we use noon, and the result may shift by a day; then we show both possible days.
Full and new moons come from the same lunar calculation, meteor shower peak nights from the International Meteor Organization’s average values, and Mercury’s stations from an astronomy-engine table checked against NASA JPL. Days are shown in your time zone.
The calculation runs in your browser. Your birth date, time and place are never sent to us or to any server; the calendar file is made on this device too.
Questions
- What is a lunar birthday?
- It is the night the Moon returns to the phase of the night you were born: if you were born under a waxing crescent, it is the night that crescent comes back, every month. It happens twelve or thirteen times a year.
- Why doesn’t my solar return fall on my birthday?
- A calendar year has 365 days, while the Sun’s circuit of the sky takes about 365 days and 6 hours. So the Sun reaches your birth point a few hours later or earlier each year, and the return can land a day before or after your birthday.
- What if I don’t know my birth time?
- We use noon. The Moon moves about 12 degrees a day and the Sun about 1 degree, so the lunar birthday and solar return may shift by a day. Add the time and both become exact.
- What goes into the calendar file?
- Only the rows of the calendar: the name of the night, one sentence and the date. Your birth date is not written into the file; it is made on this device and your phone or computer calendar opens it.