Equatorial sundials as accurate nocturnals and the sidereal equation of time.

Details Equatorial sundials as accurate nocturnals and the sidereal equation of time. Equatorial sundials as accurate nocturnals and the sidereal equation of time.

Nov 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993auja....5...95d&link_type=abstract

Aust. J. Astron., Vol. 5, No. 3, p. 95 - 110

Astronomy and Astrophysics

Astronomy

Scientific paper

A sidereal equation of time is developed which enables equatorial sundials (and armillary spheres) to be employed as accurate nocturnals. An accuracy in the order of one minute can be achieved with such a sundial by simply aligning the gnomon with a bright star from behind the curved dial. This is in contrast to nocturnals which are typically in error by approximately one hour.

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