trustme.bro/r/…
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the claim
A lunar day lasts approximately 29.5 Earth days
the verdict
COMMON KNOWLEDGE
no citation needed for this one
refutedsupported
the weight of evidence
no sources on either side

The length of a lunar day (synodic month) is a well-established astronomical constant of approximately 29.5 Earth days, making citation unnecessary as common knowledge.

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The analysis

The claim states that a lunar day lasts approximately 29.5 Earth days, which is a fundamental astronomical fact verifiable by everyday observation and basic orbital mechanics. Following Step 0, trivially true facts by definition or observation are classified as COMMON_KNOWLEDGE, requiring no citation or paper assignment.

The paper trail · every fact has a biography
first checked04 Aug 2026
judged → COMMON KNOWLEDGE · 9504 Aug 2026
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