December 4, 2025 Northern Hemisphere Current Moon Phase

You can find more moon phase details on both of the websites used in this post by clicking on each hyperlink.

Source: nineplanets.org

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The Moon phase for December 4th, 2025 is the Full Moon phase. In this phase, the moon is 100% illuminated when seen from Earth (hence the name Full Moon).

The Full Moon happens when the moon is on the opposite side of the Earth from the Sun. The sunlight fully illuminated the moon, and this is what we call being “full”. The moon will be visible throughout the night sky as it rises at sunset in the east, transits the meridian at midnight, before setting at sunrise in the west.

The specific point at which the Full Moon occurs can be measured down to a fraction of a second. The time that passes between full moons is called the Synodic month and is 29.530587981 days long.

Fun fact…

Phase Details

Phase: Full Moon

Moon age: 14.21 days

Moon illumination: 99.91%

Moon tilt: 177.112°

Moon angle: 0.56

Moon distance: 357,061.02 km

Moon sign: Gemini

Source: MoonGiant.com

You can use this link to go forward or backward in time for Moon phase information. If you are curious, you can even find out what phase the Moon was in when you or anyone else was born.

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During a Full Moon the moon is 100% illuminated as seen from Earth and is on the opposite side of the Earth from the Sun. The point at which a Full Moon occurs can be measured down to a fraction of a second. The time it takes between full moons is known as a Synodic month and is 29.530587981 days long. Keep track of all the Full Moons throughout the year on the Full Moon Calendar >

Visit the December 2025 Moon Phases Calendar to see all the daily moon phase for this month.

Today’s Full Moon Phase

The Full Moon on December 4 has an illumination of 100%. This is the percentage of the Moon illuminated by the Sun. The illumination is constantly changing and can vary up to 10% a day. On December 4 the Moon is 14.17 days old. This refers to how many days it has been since the last New Moon. It takes 29.53 days for the Moon to orbit the Earth and go through the lunar cycle of all 8 Moon phases.’

Phase Details