On 13/04/2014 20:24, Brooke Clarke wrote:
Hi Dan:
Don't know the answer to your question but have a comment.
The dial itself doesn't appear to have a built in correction for the
EOT, i.e. the correction comes from the adjacent instruction bulletin
board.
This allows changing the instructions to account for year to year
variations like leap year or leap seconds. If that's the case then I
don't think it's fair to say the dial is that accurate, you could say
the dial plus the correction table is that accurate.
Dials like the Schmoyer or direct reading equatorial have the EOT and
longitude corrections built in.
http://www.prc68.com/I/Sundial.shtml#Schmoyer
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
You might just as well say that the Sun itself isn't that accurate,
because you need a correction table to convert solar time to clock time.
--
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Richard Mallett
Eaton Bray, Dunstable
South Beds. UK
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