Moon Phase Today

The Moon Phase tool calculates and displays the current lunar phase or the phase for any date you choose, showing the phase name, the illumination percentage of the lunar disc, and the moon's age in days within the synodic cycle. It also projects the next major phases — New Moon, First Quarter, Full Moon, and Last Quarter — with their expected dates.

To look up a date, simply select it in the input field; the result appears immediately. The graphic visualization shows the approximate appearance of the moon on that day, making the display intuitive even for people not familiar with phase names.

Knowledge of lunar phases has practical and cultural applications. Gardeners and farmers who follow biodynamic calendars use phases to determine the best time to plant, prune, and harvest. Fishermen consult the moon to anticipate fish behavior. Photographers and amateur astronomers plan nighttime outings based on sky illumination. Surfers check the moon's relationship to tides. And simply finding out what phase the moon was in on the day you were born is a curiosity that many people have had.

The calculation is based on the mean synodic cycle of 29.53 days from a known reference new moon, processed entirely in the browser without sending any data to servers.