Slide Archive | Bcgnomonics

The Equinoctial Hour in Antiquity: Which Hour is Ours?

(Mt. David Summit, 2026)

Pop Culture's Sundial

(World Sundial Day Online Conference, 2026)

Hartmann's "Exquisite Fundamental:" Drawing Dials with the Analemma

(North American Sundial Society Conference, 2025)

Intro to the Astrolabe

(Bates College Astronomy Club and Classics Club, 2025)

Take Time to Nodus Sundials

(World Sundial Day Online Conference, 2025)

BC Gnomonics: Sundial Evangelism in Progress

(British Sundial Society Bulletin Follow-Up, 2024)

Developing BC Gnomonics

(North American Sundial Society Conference, 2024)

Understanding the Astrolabe:

How a Medieval Pocket Computer Puts the Universe in Your Hands

(Mt. David Summit, 2024)