The last full moon of the decade is going to be a good one, because it'll be a rare one that's known as a full cold moon kiss. It will be visible the night of 11 December through to the morning of 12 December, depending on where you are.

A full moon rising over the Re Island Bridge in Rivedoux
A full moon rising over the Re Island Bridge in Rivedoux © Xavier Leoty/AFP via Getty Images

The reason it's called a cold moon is because the Native American name for the full moon in December is the cold moon, as it happens as temperatures drop. It is also called the long night moon in some quarters, deriving that name from the winter solstice, which has the longest night in the year.

Full moon over the Pantheon in Rome
A full moon over the Pantheon in Rome © Martin Moos/Lonely Planet

While the full moon is happening, the planets Venus and Saturn will appear closer than they usually are in the night sky. Planets are continuously moving against the stars, and on occasion, they appear to meet in the sky and share a celestial longitude, making what is called a “conjunction” or a "planetary kiss." While they appear close in the sky, planets are, of course, very far away from one another.

A full moon over a city at night.
The full cold moon will come with a the bonus of a planetary "kiss" © Wang Jun / EyeEm

The full cold moon will come with a the bonus of a planetary "kiss" between Saturn and the brighter planet Venus. The full cold moon will reach peak illumination at 12.12 EST and 05.12 UTC.

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