12-18 years

Telescope in the pocket

Dificultate: ★

Making your own sky disk

Dificultate: ★

Form the armillary sphere to the astrolabe

Dificultate: ★

The pyrenean shepherd’s dials

Dificultate: ★

Building simple sundials

Dificultate: ★

Latitude Gnomon and Guadrant for the Whole Year

Dificultate: ★

Making helioscopes with four sticks

Dificultate: ★