December 2021's Full Moon In Gemini Delivers a Well-Deserved Dose of Optimism and Good Luck

Thanks to a sweet trine to lucky Jupiter in fellow air sign Aquarius, this lunar event strikes a social, upbeat tone.

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Photo: Alex Sandoval

Whether eclipse season was a breeze or basically upended your life (see: December 2021's New Moon and Solar Eclipse Will Challenge You to Fully Embrace a New Reality), there's no doubt that 2021 continues to deliver game-changing twists and turns right up to the last minute. But the final full moon of the year — historically referred to as the "Cold Moon" — should feel like a sweet respite from all the drama. Falling in the mutable air sign Gemini, this full moon brings an abundance of high mental and social energy you can channel into bonding with your VIPs.

Ruled by Mercury, the planet of communication, this lunar event — hosted by the Twins (Gemini's symbol) and occurring on December 18 at 11:35 p.m. ET/8:35 p.m. PT — serves up buzzy curiosity, a bolstered ability to connect with others, and a happy dose of optimism and celebratory vibes. (

Here are all the details and how you can best navigate the December 2021 full moon in Gemini.

What Full Moons Mean

First, some basics on the astrological significance of a full moon: Because the moon acts as your emotional compass, ruling over your intuition and sense of security, it tends to amplify all of those themes when it's at its most full and luminous. (

Whether you're encountering a driver's road rage, noisy neighbors, or simply finding yourself in the midst of a total WTF?! moment, full moon energy can spur lots of wacky behavior. But the real dilemma here is that full moons turn up the volume on your emotions — especially those feelings that have been neglected and need addressing stat. For that reason, full moon drama often stems from people opening up about pent-up pain, stress, or trauma.

Full moons are also culmination points of regular astrological cycles. Just like your fave Netflix drama, you have various "plots" going on in your life at any given moment, and whichever story began around the corresponding new moon (the opposite of a full moon, when the celestial body isn't illuminated by the sun from our vantage point and appears completely dark) in the same sign might reach a conclusion during a full moon. For instance, this December 18 full moon in Gemini is linked to the June 10 new moon and solar eclipse.

Full moons tend to be intense — especially so if they're hitting your natal chart in a significant way — but they often serve as valuable checkpoints for looking at deeply-felt emotions and putting the finishing touches on one story before you begin another — aka closure.

Themes of the December 2021 Full Moon In Gemini

Mutable air sign Gemini is ruled by Mercury, the planet of communication, transportation, and technology. The zippy, buzzy planet colors the tone in which you express yourself, think, and gather information. It's no wonder that people born during Gemini season come into the world when we're moving from anticipation-packed springtime to jovial, even more social summertime. That vibe speaks to Gemini's curious, personable, and perpetually on-the-go vibe. Mercury also rules technology, so Geminis can easily step into the role of say, a tech wizard or social media star. At the very least, you can expect them to be the most active in the group chat. The less-than-stellar side of the Twins: They can be dualistic, mercurial, capricious, and flaky, stating something and then suddenly taking an opposing stance, talking for the sake of talking, and using their enviable communication skills to burn or manipulate. (

Regardless of its aspects to other planets, Gemini full moons ask us to get curious, gather information, and connect with others. They're generally airy, social, and more intellectually charged rather than deeply emotional and heavy. And because the main aspect of this particular December 2021 full moon is a sweet trine to Jupiter — the planet of luck, abundance, and expansion, moving through fixed air sign Aquarius — it's even more benevolent than most full moons. The harmony between the full moon and Jupiter makes for bolstered optimism and joyfulness, especially around friendships and collegial relationships, as both Gemini and Aquarius are highly platonically-oriented. In the days around December's full moon event, you could be feeling especially warm, fuzzy, and fulfilled by team projects, time with your bestie, or even interactions with casual acquaintances.

While it might sound counterintuitive, Venus, the planet of love and beauty, brings a bit of tension and confusion to the full moon party. Because it is currently in Capricorn, an industrious, cardinal earth sign, it forms an offbeat quincunx to the full moon, which may potentially spur nervousness in relationships. The way you feel (aka the moon's terrain) could be out of sync with the way you're expressing or receiving affection (Venus' realm). On the bright side: Any cringe-worthy moments can open your eyes to relationship issues — specifically imbalances — you'll want to address. (

You could be especially driven to address them because Venus is traveling very close to Pluto, the planet of power, transformation, control, and passion, which has been ratcheting up the intensity of your desires. But fulfilling those desires will take a bit more time than usual because the romance planet begins its retrograde just hours after the December full moon and moves backward through Capricorn, requiring internal self-work around your relationships, until January 29.

At the same time, mystical Neptune, the planet of dreams, spirituality, and mysticism, in mutable water sign Pisces will form a square to the full moon, which can set the stage for confusion and escapism — but also the opportunity to pair the Fish's imagination (the symbol of Pisces is a fish) with the Twins' penchant for communication to make for magical, memorable moments with friends and loved ones.

Who the December Full Moon In Gemini Will Affect the Most

If you were born under the sign of the Twins — annually from approximately May 21 through June 20 — or with your personal planets (sun, Moon, Mercury, Venus, or Mars) in Gemini (something you can learn from your natal chart), you'll feel the weight of the December 2021 full moon than most. More specifically, if you have a personal planet that falls within five degrees of the moon (27 degrees Gemini), your curiosity and desire to connect will run especially high.

Similarly, those born in fellow mutable signs Virgo (mutable earth), Sagittarius (mutable fire), and Pisces (mutable water) will feel the intensity of December 2021's full moon in Gemini. Virgo, it hits your tenth house of career; Sag, it hits your seventh house of partnership; and Pisces, it's in your fourth house of home life.

The Lucky Takeaway of December 2021's Full Moon

Every month, no matter what sign a full moon falls in, it could easily set the stage for impassioned outbursts and over-the-top drama. But when the transit occurs in an airy, lighthearted, cerebral sign like Gemini, you could feel it not so much as an invitation to swim in the deep end of your emotions but to ensure you're exerting all that extra high mental energy on matters that are genuinely close to your heart. (

As perhaps the most mercurial sign of the zodiac, Gemini's strength lies not only in its perpetual curiosity but its free-spiritedness and adaptability. Although full moons can't help but be emotional moments, this particular lunar event serves as a reminder that not every culmination point has to feel so heavy. It can be light, airy, and spirited. You can fly right into it with curiosity, playfulness, an open mind, effervescent optimism — and, ideally, surrounded by people you adore.

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