This section contains reader correspondence. Fred Sawyer corrects an article on dual sundials, attributing the self-setting property to Vaulezard (1640) rather than Tuttell (1698). Mike Faraday asks for a website to track the terminator for sunrise times. Tony Wood clarifies the location and movement of the Ross-on-Wye pillar dial.
Dials: Analemmatic,
How Sundials Work,
Historical Dials