This is a non-planar clock type built on a cylinder with a vertical axis, with the gnomon placed in the usual way, parallel to the earth's axis. The gnomon must also be aligned with the
local meridian.
The shadow produced by the tip of the gnomon on the oblique clock plane is used to read the hour and the day. It is a type of fixed clock.
This sundial includes a calendar, and the proper corrections for longitude, the equation of time, and daylight savings time, in order to obtain the correct civil time.
The geometric dimensions of the clock used in the program are input in the screen DIMENSIONS
