Phase advance rate
- Input
- 360° ÷ 29,53 dias
- Expected output
- ~12,2°/dia
Average rate of change of the phase angle.
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moon phase today
What is today's Moon phase? The tool below computes the real position of the Sun and the Moon at the current instant and shows the phase name and the exact illumination percentage, without relying on a fixed lookup table.
Average rate of change of the phase angle.
Computed live in your browser.
Real result computed by the same function the tool uses, moonInfoForDate, for that date and time; the phase angle found was approximately 150.6 degrees.
It's the Moon's visual shape at that moment (how much of the Sun-lit disc we can see from Earth), classified into one of 8 traditional names (New, Crescent, First Quarter, Gibbous, Full, and so on) based on the angle between the Sun and the Moon in the sky.
Yes, very slowly, about half a degree of phase per hour. For practical purposes, today's phase can be treated as constant throughout the day.
Yes, the phase angle is essentially the same seen from anywhere on Earth at a given instant; what changes from country to country is just the local clock time and whether the Moon is visible above the horizon at that moment.
Yes, the full calendar below lets you navigate to any month and see the phase and illumination of every day.
Use the arrow keys to move between days, Page Up or Page Down to change month.
The markers show the exact New Moon and Full Moon within the displayed month.
All Moon phase calculations run locally in your browser, no date is ever sent to a server.