From Vsauce.

☀️⏳️🕰CuriosityBox.com 🕰⏳️☀️

#sundial #watch #clock #time #daylightsavings #timezone #timekeeping #best #accurate #schmoyer #sunquest #equationoftime #orbit #seasons #shadow #history #stem #science #math #tool #railroads #sun #earth #model #simulation #frankensteinsmonster