Altitude sundials for seasonal and equal hours
Altitude sundials do not require knowledge of the N-S direction to quantify time in terms of either seasonal or equal hours. Methods for determining the corresponding dial patterns are reviewed, and accurately computed data for a latitude of 51°N presented as horizontal, vertical, rectangular, and pillar dials on both timekeeping systems.
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Document Type: Research Article
Affiliations: Astronomy Group, University of Leicester, Leicester, LE1 7RH, UK
Publication date: 1996-01-01