Noon is neither a.m. nor p.m. - the correct designation is 12 noon.
Latitude and longitude are imaginary lines encircling the Earth, used to measure positions.
A meridian is an arbitrary N-S line used by an astronomer as a zero point from where to take measurements.
The new Millennium officially started on 1 January 2001 at the Prime Meridian, Greenwich.
To be a leap year, the year number must be divisible by four – except for end-of-century years.
Julius Caesar's astronomers explained the need for 12 months in a year...
The reason has to do with the slight variation in the length of 'natural' days throughout the year...