regarding resolution the royal naval decision was decreed on trafalgar was and the new system was not then implemented there look at the ships' logs the wider nautical day was not directly affected thereby one can hardly expect for example either the us navy of the time or far flung british merchant shipping to have considered admiralty decisions when eventually known as binding don't use nautical for the astronomical day it would be well to say very explicitly at what instant of london civil time the change was made or which hours of the astronomical clock were jumped over