How is the moon phase calculated? ▾
Moon phases are calculated using a standard astronomical algorithm based on the synodic period of the Moon (approximately 29.53 days). The calculation is accurate to within hours for dates in the modern era.
What are the 8 moon phases? ▾
The 8 phases are: New Moon 🌑, Waxing Crescent 🌒, First Quarter 🌓, Waxing Gibbous 🌔, Full Moon 🌕, Waning Gibbous 🌖, Last Quarter 🌗, and Waning Crescent 🌘.
How often does a full moon occur? ▾
A full moon occurs approximately every 29.5 days. Most months have one full moon, but occasionally a month will have two — the second is called a "Blue Moon."