The Tower Hill Sundial was commissioned by London Underground Limited and unveiled by Denus Tunnicliffe on the 3rd August 1992. The time shown by the sundial varies from clock time by sixteen minutes at the most. This variation is known as the equation of time to obtain clock time, during the winter months deduct one hour from the shadow reading.

It was designed by John Chitty, an architect, with Edwin Russel, a sculptor, in association with Mike Duffie, the principal architect of London Underground Limited.

This object is part of "Scan The World". Scan the World is a non-profit initiative introduced by MyMiniFactory, through which we are creating a digital archive of fully 3D printable sculptures, artworks and landmarks from across the globe for the public to access for free. Scan the World is an open source, community effort, if you have interesting items around you and would like to contribute, email stw@myminifactory.com to find out how you can help.