Moon phase guides
The calculator answers one question quickly. These pages take longer over the questions that do not fit on it.
- The lunar cycle, explained - what happens across 29.5 days, and why individual lunations vary in length.
- How to find your moon phase - four methods, from a one-click lookup to arithmetic on paper, and the accuracy of each.
- Moon phase, moon sign and birth chart - three different measurements that get used interchangeably, and what each needs as input.
- What moon phases mean in relationships - what each separation is taken to say about a partnership, and where the soulmate idea started.
- Friends and family compatibility - the same pairings applied outside romance, and what changes when the pair is not a couple.
- Famous couples, phase by phase - public birth dates run through the calculation, with the pairings they produce.
- Phases and marriage - what lunation-cycle astrology claims about long partnerships, and the limits of the claim.
- Phase readings and attachment style - where the two vocabularies overlap, and where the comparison breaks down.
Two tools sit alongside these guides. The two-date soulmate calculator compares a pair of birth dates, and the twin flame moon phase page covers the stricter framing some readers prefer. For who writes this material, see who writes these guides.
How the 8 guides divide up
The guides split into 3 groups, and knowing which group answers your question saves reading the wrong one. 2 guides are mechanical: the lunar cycle explained covers the astronomy that produces the phases, and how to find your moon phase covers the 4 methods for getting a phase out of a birth date. Neither carries any personality material.
3 guides are interpretive. Moon phase meaning in relationships sets out what the framework claims about two people and what it refuses to claim. The friends and family guide applies the same 36 pairings outside romance. The marriage guide is about choosing a wedding date by phase, which is a planning question rather than a personality one.
The last 3 guides are corrective. Moon phase vs moon sign separates 3 measurements that get used interchangeably. The attachment style guide explains why mapping 8 lunation types onto 4 attachment styles does not hold. Famous couples runs 4 documented birth-date pairs through the calculator to show that real marriages land all over the wheel.
Where the line between astronomy and astrology falls
Every guide states which side of that line it sits on. The moon phase for a date is a measurable fact, computed from the angle between the Moon and the Sun, and checkable against any published ephemeris. The personality and compatibility readings built on that number come from Dane Rudhyar's 8 lunation types, published in 1967, and carry no scientific support.
No guide here presents a compatibility reading as evidence about a specific relationship. The methodology page documents the calculation, its accuracy limits and its sources in full.
Where to start
Start with the lunar cycle if you want to understand what a phase is before reading what one means. Start with moon phase meaning in relationships if you have already run two dates through the calculator and want the reasoning behind the result. Start with moon phase vs moon sign if another site gave you a zodiac sign and you are not sure whether it answered the same question.