Moonphase.com is your comprehensive guide to lunar cycles and celestial events. Track the current moon phase, explore detailed lunar calendars spanning from 1950 to 2050, and stay informed about upcoming lunar eclipses. Whether you're an astronomy enthusiast, photographer, gardener, or simply curious about the night sky, our accurate moon phase calculations and intuitive interface make it easy to plan your activities around the lunar cycle.
A moon phase is the shape of the Moon's directly sunlit portion as viewed from Earth. The lunar phase changes over the course of about 29.5 days as the Moon orbits Earth, creating eight distinct phases: New Moon, Waxing Crescent, First Quarter, Waxing Gibbous, Full Moon, Waning Gibbous, Last Quarter, and Waning Crescent.
Our moon phase calculations use astronomical algorithms based on Julian dates to provide highly accurate results. The phase, illumination percentage, and moon age are calculated using the same methods used by astronomers worldwide. Moonrise and moonset times are approximations adjusted for your location when available.
The Moon's gravitational pull creates tidal forces on Earth's oceans. The side of Earth facing the Moon experiences a stronger gravitational pull, causing water to bulge outward (high tide). The opposite side also experiences high tide due to inertial forces. This creates two high tides and two low tides approximately every 24 hours and 50 minutes.
A "Blue Moon" traditionally refers to the second full moon occurring within a single calendar month. This happens approximately every 2–3 years because the lunar cycle (29.5 days) is shorter than most calendar months. Despite its name, the moon doesn't actually appear blue in color during a Blue Moon.
While folklore has long suggested that the full moon affects human behavior and sleep, scientific studies have produced mixed results. Some research indicates slightly reduced sleep quality around the full moon, possibly due to increased light exposure. However, most scientists agree that any effects are subtle and likely influenced more by cultural beliefs and expectations than direct lunar influence.
The best time for moon photography depends on your goals. For detailed crater shots, photograph during quarter phases when shadows enhance surface features. For dramatic landscape shots, shoot during moonrise or moonset when the moon appears larger near the horizon. Full moons are brightest but show less surface detail. Use our calendar to plan your photography sessions in advance.