BC Gnomonics

Specialized sub-types of the OERD While the equatorial ring dial sits at both the end and peak of portable sundial development, it has...

The effect of the equinox on the equatorial ring dial Typically, when a sundial does not display the time, the explanation is that there...

The celestial sphere in armillary dials Recently, I had the opportunity to visit one of the finest armillary sundials in the country,...

Do heliochronometers enhance or limit the intuitive understanding of the celestial sphere? Most extant sundials today were built for a...