MOZART::EDELMANN wrote: > > Fer deVries: > > Greetings again! > > I had a question about the dial plot routines. Should I wish to make a gnomon > of thickness, say, 2mm or more, would it be appropriate to cut the plot down > the > middle, and separate the two halves by the thickness of the gnomon? I assume > all lines and angles will remain accurate? > > Thanks! > > John.
John, No, you can't just cut the dial into 2 parts. You have to cut it into 4 parts. Take in mind a horizontal dial. The hourlines ( in real suntime ) between VI in the morning and VI in the evening have to be split to the outside. The early morning hours from sunrise to VI and the late hours from VI to sunset, have to be split to the inside. In fact you have two separated styles, one for VI to XII in the morning and the hours from VI in the afternoon to sunset. The other style is for XII to VI in the afternoon and the hours from sunrise to VI in the morning. Also other lines have to be split in this way, because you have to make 2 indexes, one on each style. I was at holiday, so my answer is some late. About your second e-mail with the question about the movement of a dial, a movement in north-south direction is possible by tilting the dial at one side. The dial may read suntime or time corrected for longtitude. When also moving the dial in east-west you have to turn the dial around the style. In that way it is possible to move a dial which reads suntime but not if the dial reads time, corrected for longitude. Such a dial is somewhat strange oriented and the number of hourlines can become incorrect. I don't prefer to move a dial. Fer.
