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[fitsbits] Draft WCS Paper V: Time
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/CadresFene...26&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 WGS-84 (GPS) UCO/Lick Observatory Natural Sciences II, Room 165 Lat +36.99855 University of California Voice: +1 831 459 3046 Lng -122.06015 Santa Cruz, CA 95064 http://www.ucolick.org/~sla/ Hgt +250 m |
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