The Armillary Type Sundial

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  Armillary or ring sundials consist of a system of rings that represent the major circles of the terrestrial and celestial spheres. The hour lines are evenly spaced on the equatorial ring. The style is the axis of the sphere. Types of Sundials

  The time on the ring dial below is 4:13. The photo was taken on 24 September. The correction for that day is -8 min. Therefore the correct time is 4:05.

Analemmatic dials
Conical or Scaphe dials
© Helga Nordhoff