Jeb Riordan wrote: > > Can anybody please supply me with a table showing the angles between the > hour lines for a horizontal sundial situated at Lat 21deg 20 min N, Long > 71deg 20 minW > (Caribbean 575 miles East South East of Florida USA). > > Please also confirm that the angle of the gnomom should be 21deg20min from > the horizontal. > > Note1: I have searched all locations identified by Yahoo. All good > information and pictures but no details other than a small computer > generated diagram, which is OK. However I need to be accurate and would > prefer to construct the hour lines from a table of angles. > Note2: I am new to Internet and even newer to sundials. I hope this is > acceptable netiquette. > > Thanks, > > Jeb Riordan.
For local suntime, with XII when the sun is due south, calculate the angles z with tan z = sin phi . tan t phi = latitude t = hourangle XII t = 0 I t = 15 II t = 30 XI t = -15 X t = -30 and so on. Fer J. de Vries Netherlands
