December 2022
Page 28

The Equation of Time in Your Phone’s Calendar

Describes a Python program used to calculate weekly or daily Equation of Time values and insert them into a digital calendar. This provides an accessible reference for checking sundial accuracy and noting when the EoT is zero.
DIY Sundial Projects, Equation of Time

Andrew Hodgson

March 2021
Page 17

The Equation of Time at Kew

The author discusses finding a replica of a 1690 Thos Tompion dial at Kew Gardens. He notes that the engraved Equation of Time table is inaccurate for modern dates because it faithfully reproduces the original pre-Gregorian calendar data, leading to an 11-day shift in the zero crossing date.
Equation of Time, Historical Dials

Andrew Hodgson