"Regarding resolution 6:" 

The Royal Naval decision was decreed on 1805-10-11; Trafalgar was 1805-10-21 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 12 hours of the astronomical clock were jumped over.

82.163.24.100