On iPhone: press and hold the image, then “Save to Photos”.
Two birthdays. The moon you share, and how compatible you really are: how you fight, how you see each other, what makes it work.
For entertainment. Phases from ecliptic longitudes; Chinese years by the solar boundary (4 Feb); numerology by full birthdate. Nothing is stored on a server.
Full compatibility chart
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On iPhone: press and hold the image, then “Save to Photos”.