F·FEYNMANTHE SCIENCE OF UNDERSTANDING← ExperimentsDay length and latitude
LIVE EXPERIMENTExplore parameters
Static experiment diagram

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Formula & readings MODEL

D(φ,δ)=24πarccos⁡ ⁣(−tan⁡φ tan⁡δ)D(\varphi,\delta)=\dfrac{24}{\pi}\arccos\!\left(-\tan\varphi\,\tan\delta\right)