Your date of birth could already tell enough a lot about yourself
WHY
Possibly, the more minimal data that can produce the more analises (whether you consider them reliable or not) is a date of birth interpreted by different astrologies.
Different astrologies have different ontologies and vocabularies. There is not a more perfect astrology than another, they are very reliant in the cultural background of each person. Nevertheless, remixes for them will be very useful for many mommentums.
WHAT: OpenAstro, a DateOfBirth centric app
There are some common estructures and keywords that can be translated from one astrology to another andor to more custom vocabularies, i.e more practical task making categories.
HOW:
Related projects: CivilX, Genekeys, MarySoliris bridging Tzolkin calendar and Hexagrams from Iching, etc