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 farflung British merchant shipping to have considered Admiralty decisions when eventually known as binding  Dont 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