On Sat 2013-08-31T16:29:54 +0100, Lester Caine hath writ:
Again, cart before horse, I'd been looking recently at time material based on sundial mid day and looking to incorporate that into my own time management stuff. I was getting around to the point of asking if anybody has a preferred estimation they use but decided this was not the right venue?
Even if this were the right venue, choosing a boundary for the transition between local apparent time and local mean time is just as arbitrary as a boundary for adoption of standard time. As a result of the widespread use of chronometers the UK Admiralty dictated that 1833 was the boundary for the Nautical Almanac, but in the footnote added to the Future of UTC meeting 2 years ago http://www.cacr.caltech.edu/futureofutc/2011/preprints/21_AAS_11-669_discuss... At Mystic Seaport library Frank Reed found logbooks with worked lunars where navigators got aberrent longitudes because they had not adapted to the change in the Almanac. For non-navigational clocks of lesser quality we should expect that resetting them according to some noon mark was the practice until the local advent of telegraph and rail modified civic practice. -- Steve Allen <sla@ucolick.org> WGS-84 (GPS) UCO/Lick Observatory--ISB Natural Sciences II, Room 165 Lat +36.99855 1156 High Street Voice: +1 831 459 3046 Lng -122.06015 Santa Cruz, CA 95064 http://www.ucolick.org/~sla/ Hgt +250 m