Analemmatic sundial

Analemmatic sundial on a meridian line in the garden of the Herkenrode Abbey in Hasselt (Flanders in Belgium)
Analemmatic sundial in which the Barbate lighthouse forms the gnomon of the dial

Analemmatic sundials are a type of horizontal sundial that has a vertical gnomon and hour markers positioned in an elliptical pattern. The gnomon is not fixed and must change position daily to accurately indicate time of day. Hence there are no hour lines on the dial and the time of day is read only on the ellipse.[1] As with most sundials, analemmatic sundials mark solar time rather than clock time.

  1. ^ "Analemmatic sundials: How to build one and why they work", C.J. Budd and C.J. Sangwin, maths.org, 1 June 2000