Angle of the sun


Mesure or calculate the angle of the sun towards the vertical


On a same day , compare results and their accuracy with different methods of gnomons


Slideshow or pdf of the observations

Pedagogical module

Direct measure with a protractor or a quadrant

Scale drawing

Trigonometric calculation

Angle of the sun = INV TAN (shadow/gnomon)= arctan(shadow/gnomon)=arctan(12.8/10)=52°

Automatic calculation in: