Recent Blogs
Equatorial Sundial: Latitude and Axis-orientation Comparison
Explore a polar gnomon and equatorial ring. Compare latitude with an entered setting offset and 15-degree hour spacing; shadow and clock time are not calculated.
Mean-Time Sundial: Equation of Time and Longitude
Convert an apparent sundial reading to local mean and zone-standard time using an annual equation-of-time approximation and a separate longitude correction.