The phases of the moon – moon calendar

The moon changes appearance in a fixed cycle of about 29.5 days, because we see different parts of its lit side as it moves around Earth. The moon calendar below shows the phase for every day of the month – use the arrows to browse back and forth.

The eight moon phases

• New moon 🌑 – the moon is invisible; read more about new moon.
• Waxing crescent 🌒 – a thin sliver of light grows.
• First quarter 🌓 – half the disc is lit and growing.
• Waxing gibbous 🌔 – more than half is lit.
• Full moon 🌕 – the whole disc is lit; read more about full moon.
• Waning gibbous 🌖 – the light begins to fade.
• Last quarter 🌗 – half is lit and waning.
• Waning crescent 🌘 – only a thin sliver of light remains.

Why does the moon change phase?

The moon does not shine by itself – it reflects sunlight. As the moon orbits Earth, the angle between the Sun, Earth and Moon constantly changes, so we see different parts of the lit half. This angle determines the phase and the illuminated fraction.

See also the moon today for your location, or the almanac with sun and moon together.

Frequently asked questions about moon phases

How many moon phases are there?

There are eight named moon phases in a full cycle: new moon, waxing crescent, first quarter, waxing gibbous, full moon, waning gibbous, last quarter and waning crescent.

How long is a lunar cycle?

A full cycle from new moon to new moon lasts about 29.5 days. This is called a synodic month.