Chapter 7. An Indoor Sundial
Itâs entirely absurd to design and construct an indoor sundial like the one shown in FigureÂ 7-1, which is why itâs so fun to do so. Weâll craft our sundial as a tongue-in-cheek nod to the astronomical timepieces that have existed for millennia.
Unlike traditional sundials, which require a clear day and an outdoor location, weâll use our own âsunâ and position it as needed to tell, roughly, our own local solar time.
A horizontal-style sundial is typically disk shaped, constructed with a hand or pointer, called the gnomon, which is aligned to true north (or due south in the southern hemisphere). The gnomon rises away from the center of the disk at an angle equivalent to the local latitude. ...