12-18 years

Telescope in the pocket

Difficulty: ★

Making your own sky disk

Difficulty: ★

Form the armillary sphere to the astrolabe

Difficulty: ★

The pyrenean shepherd’s dials

Difficulty: ★

Building simple sundials

Difficulty: ★

Latitude Gnomon and Guadrant for the Whole Year

Difficulty: ★

Making helioscopes with four sticks

Difficulty: ★