Translations:Dimensionner et faire un tracker solaire photovolatïque low tech/133/en

The 21st of december, when we look at the south, the sun follows a trajectory that starts at -50° azimut (along the East on the horizontal axis) at dawn, then when the sun goes west during the day (we follow the red curb), it takes height until it reaches 17° height (on the vertical axis) at noon (position 0° azimut on the horizontal axis) and then goes down again to 0° height when it sets (along the West on the horizontal axis)