When
does a “day” start?
set Universal
Time using
the Greenwich Meridian (Britannia rules the waves...)
since "noon" drifts around the Earth, need International Date Line to make the day change
(avoid political boundaries for convenience)
since "noon" drifts around the Earth, need International Date Line to make the day change
(avoid political boundaries for convenience)
the Earth moves around
the Sun at varying speeds, so let's use the "mean solar day"
