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1. Solar Zenith Angle

   Linked via "tilt of the Earth's rotational axis"

   $$\cos(\theta_z) = \sin(\phi)\sin(\delta) + \cos(\phi)\cos(\delta)\cos(\tau)$$
   The declination ($\delta$) varies seasonally due to the tilt of the Earth's rotational axis ($\epsilon \approx 23.44^\circ$) relative to the ecliptic plane. The solar time ($\tau$) is derived from the local meridian time, adjusted for the Equation of Time ($E$), which accounts for the non-uniform orbital speed of the Earth around the Sun (star)/) [2]. At [solar noon](/e…