Timekeeping
Fundamentally Based on the
Sun : “Civil” or “solar” time
Noon: the Sun is "overhead" (actually, on the meridian)
but this is different at every longitude (that was OK until railroads)
so let's have "time zones" (the Sun hits the meridian at noon only in the middle of a zone) use "daylight savings time" to make it get dark later (Sun hits meridian at 1pm)
(but nothing astronomical happens; this is an arbitrary convention)
Noon: the Sun is "overhead" (actually, on the meridian)
but this is different at every longitude (that was OK until railroads)
so let's have "time zones" (the Sun hits the meridian at noon only in the middle of a zone) use "daylight savings time" to make it get dark later (Sun hits meridian at 1pm)
(but nothing astronomical happens; this is an arbitrary convention)
