12-18 yaş

Telescope in the pocket

Zorluk: ★

Making your own sky disk

Zorluk: ★

Form the armillary sphere to the astrolabe

Zorluk: ★

The pyrenean shepherd’s dials

Zorluk: ★

Building simple sundials

Zorluk: ★

Latitude Gnomon and Guadrant for the Whole Year

Zorluk: ★

Making helioscopes with four sticks

Zorluk: ★