Find the current moon phase for any date. Get illumination percentage, moonrise/moonset times, lunar cycle position, and upcoming full/new moon dates.
The Moon Phase Calculator determines the exact phase of the moon for any date, past, present, or future. Using precise astronomical algorithms, it calculates the moon's position in its 29.53-day synodic cycle, showing you the phase name, illumination percentage, and days until the next major phase.
Whether you're planning outdoor photography to capture the perfect moonlit landscape, scheduling a fishing trip based on lunar feeding patterns, organizing a stargazing event during a new moon, or simply curious about tonight's moon, this calculator provides all the lunar data you need at a glance.
The tool covers all eight traditional moon phases: new moon, waxing crescent, first quarter, waxing gibbous, full moon, waning gibbous, third quarter, and waning crescent. It includes a visual representation of the current phase, a monthly calendar view, and a table of upcoming major lunar events. Gardeners, astronomers, photographers, and outdoor enthusiasts all rely on accurate moon phase data for planning their activities. A quick phase check can also help you pick the right night for observations when the sky needs to stay dark.
Use this calculator when you need a quick lunar snapshot for a date without digging through almanacs or astronomy apps. It is helpful for photography planning, dark-sky trips, classroom demos, gardening schedules, and simple curiosity about where the moon sits in its monthly cycle. The result gives you the phase, illumination, and timing in one place instead of scattered across references.
Days Since Known New Moon = (Julian Date − 2451550.1) mod 29.530588853; Phase Angle = Days × (360° / 29.53); Illumination ≈ (1 − cos(Phase Angle)) / 2 × 100%
Result: Waning Gibbous, 78% illuminated, Age: 18.4 days
A moon that is about 18.4 days old is past the full moon and into the waning gibbous phase. At that point in the cycle, the illuminated area is still large, but it is shrinking each night on the way toward third quarter.
The moon orbits Earth in approximately 27.3 days (sidereal month), but because Earth is also moving around the sun, the phase cycle (synodic month) takes about 29.5 days. During this cycle, the moon passes through eight recognized phases based on the angle between the sun, Earth, and moon. The new moon occurs when the moon is between Earth and the sun, making the illuminated side face away from us.
For thousands of years, human cultures have organized activities around the lunar cycle. Farmers planted crops by moon phases, fishermen planned trips around tides influenced by the moon, and navigators used the moon for timekeeping and direction-finding. While modern science has replaced some of these traditions, many outdoor activities still benefit from lunar awareness.
The moon reflects approximately 12% of the sunlight that hits it, yet at full phase it's bright enough to cast shadows and illuminate landscapes for photography. The intensity varies with the moon's distance from Earth: a supermoon at perigee can be up to 14% larger and 30% brighter than a micromoon at apogee. Understanding these variations helps photographers and event planners optimize their timing.
The synodic month (new moon to new moon) averages 29.530588853 days, but varies between 29.27 and 29.83 days due to the moon's elliptical orbit. That is why the dates of full moon and new moon shift a little from month to month.
Waxing means the illuminated portion is growing (new moon to full moon). Waning means it's shrinking (full moon to new moon). In the Northern Hemisphere, the moon illuminates from right to left. In the Southern Hemisphere, that pattern appears reversed.
Many anglers believe fish are more active during new and full moon phases due to stronger tidal forces. The Solunar Theory suggests major feeding periods occur during moon transit and opposition. Even if you do not use the theory, moon phase can still be a useful planning cue.
Crescent moons (15-35% illuminated) offer dramatic landscapes with soft moonlight. Full moons illuminate landscapes but make star photography difficult. New moons are best for astrophotography. The best phase depends on whether you want foreground light or a dark sky.
Traditional lunar gardening suggests planting above-ground crops during waxing phases and root crops during waning phases. While scientific evidence is limited, many gardeners follow these traditions. The calculator is useful when you want to align planting plans with that schedule.
Yes. The moon is visible during daylight for roughly half of each month. It's easiest to spot during first quarter (visible afternoon/evening) and third quarter (visible morning). Bright daylight just makes it harder to notice unless you know where to look.