Lunar Calendar – Monthly Moon Phases
View a monthly lunar calendar showing moon phases for every day.
Sun
Mon
Tue
Wed
Thu
Fri
Sat
How It Works
Select a month and year. The calendar computes the moon phase fraction for each day and displays the corresponding phase emoji and name.
Formula
Phase per day = ((julianDay - 2451550.1) / 29.53059) % 1
Frequently Asked Questions
How many moon phases are in a month?
Each calendar month typically contains all 8 moon phases: New Moon, Waxing Crescent, First Quarter, Waxing Gibbous, Full Moon, Waning Gibbous, Last Quarter, and Waning Crescent.
Does every month have a full moon?
Almost always. Most calendar months have exactly one full moon. Occasionally February can miss a full moon if the full moon falls in late January and early March.