PATH OF SUN ACROSS SKY
The animation on the right shows the annual path the sun traverses across the sky as seen from Earth for northern hemisphere observers .
The animation represents a complete 360° flat projection of the CELESTIAL SPHERE  using RIGHT ASCENSION and DECLINATION for its axes.
The apparent "sine wave" that the Sun tracks (shown in yellow) is due to the tilt of the Earth's Axis.
This 23.44° tilt is also what causes our seasons, which are depicted using four distinct symbols.