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Dieter · (This post was last modified: 10-10-2014 07:10 PM by Dieter.)

(10-10-2014 08:23 AM)walter b Wrote: Footnote 18 on that NIST site reads: "This conversion factor is based on 1 d = 86 400 s; and 1 Julian century = 36 525 d.

Which is correct for a Julian century.

Quote:(This definition is not consistent with the length of a year being 365.2425 days.

Which is correct for an average Gregorian year.

Quote:But there are even more definitions of a year...)

You bet. So the question is: which definition of a year is valid for a light year? A tropical year maybe? This varies permanently so that anything more precise than 365,242... days/year would not make much sense.

Dieter