[fitsbits] Draft WCS Paper V: Time

[Steve Allen]

On Mon 2009-04-06T22:24:59 -0700, Rob Seaman hath writ:
> It sounds like the Herschel reference is
> equivalent to a standard defined by source code.

For the record, it's online in these forms

Herschel, John. Outlines of astronomy (4th edition) by Sir John F. W. Herschel,.... 1851.
http://adsabs.harvard.edu/abs/1851atoa.book.....H

The first edition was from 1849.
http://adsabs.harvard.edu/abs/1849QB43.H56.......

The 4th edition page images are online here
http://visualiseur.bnf.fr/CadresFenetre?O=NUMM-94926&I=649&M=tdm

Notable pages are in Chapter XVIII:
629
	he offers the never-adopted rule that the Gregorian
	calendar should omit a leap in years divisible by 4000.
632
	he starts ruminating about the Julian period
634
	he gives Scaliger's origin of the Julian day number
644
	different interpretations of ephemerides in produced
	a day with 3 minutes of "purely imaginary time"

--
Steve Allen                 <sla at ucolick.org>                WGS-84 (GPS)
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