[LEAPSECS] Schedule for success

Rob Seaman seaman at noao.edu
Mon Dec 22 13:27:49 EST 2008

Tony Finch wrote:

> On Mon, 22 Dec 2008, Rob Seaman wrote:


>> No. We have been using mean solar time formally since the 19th

>> century, and informally since we woke each morning to light shining

>> through

>> the entrance of the cave.


> Apparent solar time is not mean solar time. Remember that for a lot of

> history we used rubber hours that varied according to the time between

> sunrise and sunset. Mean solar time cannot be established without

> reasonably accurate clocks.

Either you haven't read this message yet:


or I've yet again failed to make my point.

Mother Earth "establishes" mean solar time simply by spinning on its
axis and orbiting the sun. Apparent solar time is a mere happenstance
of angles. Rates matter more than offsets.


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