Question: Shepherd Gate Clock was probably the first to display the solar time at which location in London?
Sentence (from "Greenwich Mean Time"): Today GMT is considered equivalent to UTC for UK civil purposes (but this is not formalised) and for navigation is considered equivalent to UT1 (the modern form of mean solar time at 0° longitude); these two meanings can differ by up to 0.9 s. Consequently, the term GMT should not be used for precise purposes.
Relevant evidence: No