New Moon
Phase angle: 0°
Moon phase calculator: birth date, next full moon and comparison
Find the Moon’s phase, illumination and tropical sign for a precise moment. Compare two dates, see the next four principal phases and download their calendar.
How to use the calculator
Choose a date from 1900 to 2099, an exact clock time and its IANA time zone, such as Europe/Brussels. The initial date uses the current UTC minute. For a birth date, replace all three fields. If the birth time is unknown, try the beginning and end of that local day as the two dates: their differences show sensitivity to time, not a confirmed birth result.
Calculations stay in your browser. JSON downloads include the selected moments; store or share them deliberately.
New and full moon calendar by zodiac sign
Calculate a whole year from 1900 to 2099. Filter new moons or full moons by tropical sign, display their local time and download only the events shown.
The calendar searches for the instants when the Moon–Sun ecliptic longitude difference is 0° (new moon) or 180° (full moon). It assigns the Moon’s tropical sign at that instant. A new moon in Taurus means the Moon and Sun share the Taurus sector; a full moon in Taurus places the Sun approximately opposite, in Scorpio.
A calendar year is selected in your chosen time zone. An event near midnight can fall on another day, or even another year, elsewhere. The UTC column identifies the same instant across services. The geographic location does not change the geocentric phase time; this tool does not calculate local moonrise or visibility.
Most years contain 12 or 13 full moons and 12 or 13 new moons. A sign filter can show zero, one or more events: it does not promise one event for each sign. Try 2026 with both phases, then select a single sign and compare the remaining rows.
The ICS file includes only the rows currently displayed, with UTC event times. Your agenda converts them to its own time zone. Re-importing a changed file may create duplicates depending on the agenda: inspect its import options. The positions are calculated; claims about romance, money or health are not inferred from them.
Is this a horoscope for the year?
No. It is a computed timetable with tropical zodiac sectors. It does not contain personal predictions.
Why does my agenda show another hour?
It normally displays UTC events in its configured time zone. Compare the UTC instant and check daylight-saving settings.
Does a full moon mean an eclipse?
No. Most full moons are not eclipses. This tool does not test eclipse geometry.
Why can the same sign appear twice?
Lunar cycles and calendar years do not fit into exactly twelve equal slots. Keep the calculated event dates rather than assuming one event per sign.
Read the result accurately
The time zone converts a clock reading into an instant. It is not an observing location: no latitude is needed for these Earth-centred quantities. A clock time skipped during a daylight-saving change is rejected. A repeated time requires you to choose its first or second occurrence. The results display UTC so that two services can be compared using the same instant.
The angle is the Moon’s ecliptic longitude minus the Sun’s, wrapped into 0–360°. The illuminated percentage describes the visible disc lit by the Sun. Lunar age is elapsed time since the preceding calculated new moon, not the angle multiplied by a fixed 29.53-day cycle. The tropical sign is a separate 30° longitude sector; it is not the phase or an astronomical constellation.
Example: same illumination, different phases
At phase angles near 90° and 270°, the disc is about half illuminated. The first quarter is waxing; the last quarter is waning. A similar percentage therefore does not imply the same point in the cycle. In the simplified angle formula, 60° and 300° both give 25% illumination, but they lie on opposite sides of the cycle. The tool uses three-dimensional illumination, so its percentage can differ slightly from this classroom approximation.
Comparing birth moons responsibly
Use the comparison to notice angle and illumination differences, then discuss an actual shared question if you wish. Two silhouettes that seem to complete a circle do not establish a soulmate match. A difference of 0° means the phase angles match; 180° means they are opposite. Neither number ranks a relationship. Compare time uncertainty before attaching a symbolic interpretation.
Method and limitations
Astronomy Engine 2.1.19 calculates geocentric phases, illumination and tropical longitude locally. The next 0°, 90°, 180° and 270° events are searched separately and sorted by time. The calendar download contains those instants in UTC; a calendar app may display its own time zone. The disc is a simplified geometric diagram, without libration, terrain, horizon rotation, weather or eclipse shading.
Waxing Crescent
Phase angle: 45°
First Quarter
Phase angle: 90°
Waxing Gibbous
Phase angle: 135°
Full Moon
Phase angle: 180°
Waning Gibbous
Phase angle: 225°
Last Quarter
Phase angle: 270°
Waning Crescent
Phase angle: 315°
Questions about lunar phases
Why does another website show a different phase name?
Names may use different angular sectors or time windows around the four principal events. Compare the angle, instant and illumination before deciding that a calculation is wrong.
Can I use this without knowing my birth time?
Yes, as an exploration. Compare two plausible times on that date. Do not present noon as a known birth time or infer a precise sign near a boundary.
Is the phase different in another country?
The Earth-centred phase refers to the same global instant. Local dates, visibility and the disc’s orientation can differ. This tool does not calculate moonrise or local viewing conditions.
Does a full moon label mean 100% illumination?
Not necessarily. The label covers a sector around 180°. The exact full-moon event is defined by longitude; lunar latitude can also keep the illuminated fraction slightly below 100%.
Does the comparison calculate romantic compatibility?
No. It compares astronomical quantities. It gives no soulmate verdict, probability or relationship score.
Why does the Moon change on my birthday each year?
A lunar cycle does not divide evenly into a calendar year. Keep the full year, date, time and zone when checking a birth Moon; a recurring calendar birthday is a different instant.
Can I import the next phases into my calendar?
Calculate first, then download the ICS file. It contains four timed events after date 1. Check the time zone shown by your calendar app; importing twice may create duplicate events.
Sources and verification
To check another calendar, compare its UTC event time, not just its date label or rounded percentage. For an independent example, the US Naval Observatory lists the new moon on 9 November 2026 at 07:02 UT. Small differences can follow model and rounding choices; the verification report records the actual test tolerance. A lunar phase alone does not tell you whether the Moon is above your horizon.