BC Gnomonics

Two of a kind The scaphe and hemicyclium each do an excellent job of imaging the celestial sphere in microcosm, arguably more intuitively...

Wooden and paper astrolabes Though the vast majority of surviving astrolabes are made from durable materials such as brass, these were...

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

Interactive models, further reading, recommended sellers, and more Already underway is a grand summer update, the first major influx of...

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...

Two of them, in fact The video below offers a demonstration of the effects of a wide gnomon on horizontal sundials. When the gnomon of a...

To classify sundials is a notoriously difficult task Pinning down the defining characteristics of anything man-made proves difficult, as...

Welcome to BC Gnomonics! On this site, you will find a variety of resources diagramming the practical uses of sundials, astrolabes,...