12-18 anys

Telescope in the pocket

Dificultat: ★

Making your own sky disk

Dificultat: ★

Form the armillary sphere to the astrolabe

Dificultat: ★

The pyrenean shepherd’s dials

Dificultat: ★

Building simple sundials

Dificultat: ★

Latitude Gnomon and Guadrant for the Whole Year

Dificultat: ★

Making helioscopes with four sticks

Dificultat: ★