Elizabeth I dies and James VI of Scotland accedes to the English throne. Elizabeth I died childless so was succeeded by her cousin, James VI of Scotland, who henceforth assumed the title of James I of England as well.
T minus zero means out of time.. This comes from a countdown convention used in by both the American military and NASA. Generally, it is used when counting down to a major event that will happen at a specific time. Mathematically, T is time, minus whatever amount of time is left until the event happens.
People are happy to use this phrase having no idea what a 'T' is. The expression 'to a T', is often extended to form other phrases: 'down to a T', 'suits to a T', 'fits to a T', 'generous to a T' etc. It is also found in advertising copy like 'Golf to a tee' and 'Coffee to a tea'.