What Is Moon Phase Compatibility?

I’ve never been much of a TikTok girlie, but every so often, I get sucked down the rabbit hole. During this summer’s annual deep dive, I found myself both amused and absolutely entranced with the vision of two moons approaching each other from opposite ends of the screen, meeting in the middle to form one moon. This was the Moon Phase Compatibility Test trend. Good on the algorithm for knowing this would be irresistible to my astrologer eye. I watched video after video by creators testing their compatibility with their crush, their partner, and even their mom. 

What’s so interesting about this trend is that it strays from pop astrology’s usual focus on personality traits, and instead focuses on the visual appearance of the moon. This excites me as an astrologer as it gets back to astrology’s roots of looking up at the night sky. With this trend, people aren’t fixated on the moon’s sign, but on the moon’s phase (which is an important indicator of the energy that one brings to life). While it thrills me as an astrologer to see people engaging with their moon phase, does that automatically mean this trend is legit? Here’s the breakdown of what the Moon Phase Compatibility Test is, and what the results can tell you about other people and yourself.

The Moon Phase Compatibility Test is a TikTok trend in which you compare the moon phase you were born under to the natal moon phase of your crush, lover, bestie, etc. to see if it's a match. The “match” part of it is where I, as an astrologer, begin to roll my eyes at moon phase compatibility. Yes, what moon phase you were born during does give a wealth of information as far as the energy that you bring to life (you can find out what moon phase you were born at here.) But the idea that this can determine who is a “soulmate” and who is a “twin flame” is, IMHO, cringe. 

Here’s a very basic breakdown of each moon phase:

• New - optimistic outlook, young at heart, trusting approach to life, excited to be here
• Waxing Crescent - ambitious, adventurous, curious
• First Quarter - experimental, crisis managers, problem-solving, growth-focused
• Waxing Gibbous - motivated, strong work ethic, perfectionist
• Full - extraverted, wears heart on sleeve, life of the party
• Waning Gibbous - the social nucleus, teachers, organizers
• Last Quarter - thoughtful, visionary, very self and socially aware
• Waning Crescent - introspective, deep wisdom, focused on distillation and integration

How to Calculate Moon Phase Compatibility

To determine whether you and your crush are moon phase compatible, you can enter yours and their birth information here (or on a plethora of other apps). Doing this will calculate whether someone is your soulmate or “twin flame.” Others tell you a percentage match.

Combinations that come together to form a Full Moon are thought of as “Soulmates,” whereas anyone born under the same moon phase is a “Twin Flame.” 

Some have taken the categorization even further, pointing out phases that speak to “temporary soulmates,” “psychic connection,” or someone “on a completely different path.”