12-18 years

Telescope in the pocket

Dificultad: ★

Making your own sky disk

Dificultad: ★

Form the armillary sphere to the astrolabe

Dificultad: ★

The pyrenean shepherd’s dials

Dificultad: ★

Building simple sundials

Dificultad: ★

Latitude Gnomon and Guadrant for the Whole Year

Dificultad: ★

Making helioscopes with four sticks

Dificultad: ★