Ralph Dieter FEDRA wrote: > > I want to build ring dials (pokes) and I want to understand, why it is > impossible to construct an accurate dial based on this idea. So my > question: > > Does anybody knows, how to construct a ring dial if you know the > equation for the heigh of the sun? > Or does anybody know a book, where I can find the appropriate formulas? > > Many Thanks from Dieter Fedra
Read the article of Colin J. Thorne in the BSS bulletin 96.1. Fer J. de Vries.
