How is it determined that the Earth is tilted on its axis by 23.5 degrees?
In: Planetary Science
Its rotation is tilted that much relative to its orbit. It’s a pretty easy one to measure. Dangle a weight on a string so you know it’s perfectly plumb and track its shadow day to day over the course of a year. The most it ever leans is when the planet is tipped away/towards the sun the most and it leans at the same angle. Replace the plumb bob with some giant stone monoliths, start lining up other celestial bodies and boom you’re a paleolithic.
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