Zodiac CompatibilitySigns and relationship charts

Explore the atlas

Calculators
Browse 33 pages
Sign atlas
Browse 13 pages
Placements
Browse 4 pages
Synastry readings
Browse 4 pages
Relationships
Browse 5 pages
Zodiac reference
Browse 4 pages
Sun sign pair guides
Browse 78 pages
Factors
Browse 21 pages
About
Browse 3 pages

Two birthday Moons

Moon phase compatibility

Compare the Moon’s shape on two birthdays side by side. Enter each person’s local birth date and time zone to see their phase and illuminated fraction.

First person

Leave the time blank to compare the phases at local noon.

Second person

Leave the time blank to compare the phases at local noon.

Do complementary Moons mean soulmates?

The popular Moon-phase trend compares the lit shapes of two birthday Moons. Complementary shapes can make an appealing image, but the combined image does not measure a relationship’s quality. This comparison shows the actual astronomical phases. For an astrological reading of emotional needs, compare Moon signs.