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You can’t actually detect those without precise modern measurements since axial tilt effects swamp weather and insolation differences are tiny due to low orbit eccentricity
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They’re not actually. The Hindu calendar is lunisolar and it’s horrible. An entire breed of priests collects rents simply calculating dates. The months are strict lunar 28 days so in some years you add an entire extra month. No layperson plebe could do the calculations.
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