Analemmatic dials

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The analemmatic sundial is also called the variable centre dial. Analemmatic sundials are not common and make use of a movable gnomon. The gnomon is vertical and its position is dependent on the date - therefore the variable centre. The hours are indicated by points that fall on the circumference of an ellipse. If made to a large scale this type of dial can be very interactive and entertaining, since the visitor (instead of a pole) becomes the gnomon.

Detailed instructions for the construction of an annalemmatic sundial for Johannesburg / Pretoria, Gauteng Province, South Africa can be found on the HartRAO web site.

Analemmatic dials are altitude dials.

Types of Sundials

 

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© Helga Nordhoff
2001-2003