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the claim

Birth order and zodiac signs determine personality.

the verdict
INSUFFICIENT LEANING
Recorded sources
0 sources for · 3 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that birth order and zodiac signs determine personality?

Unclear. Several sources indicate that research finds little to no robust effect of birth order on personality, and one historical text rejects natal astrology. No placed source directly tests whether zodiac signs determine personality, so the evidence only partially addresses the claim.

Verdict: PARTIAL LEAN · 0 sources for, 3 against · Last checked

The private library was unavailable for some searches in this check. Missing library results are not evidence against the claim.

Evidence against · 3
Birth order
Get citation
Birth order. (n.d.). en.wikipedia.org. https://en.wikipedia.org/wiki/Birth_order

See more details
More against · 2
A History of Magic and Experimental Science, Volume 1 (of 2)
Get citation
A History of Magic and Experimental Science, Volume 1 (of 2). (n.d.). gutenberg.org. https://www.gutenberg.org/ebooks/67792

Revisiting the Relationship between Birth Order and Romantic Jealousy: No Support for an Effect in Four Samples
2025
Get citation
Revisiting the Relationship between Birth Order and Romantic Jealousy: No Support for an Effect in Four Samples. (2025). osf.io. https://osf.io/preprints/psyarxiv/hn2j4_v1/

Receipt History
held for human review17 Oct 2026
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