WP 34S conversion error
10-10-2014, 07:44 PM (This post was last modified: 10-10-2014 07:44 PM by walter b.)
Post: #9
 walter b On Vacation Posts: 1,957 Joined: Dec 2013
RE: WP 34S conversion error
(10-10-2014 07:04 PM)Dieter Wrote:
(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.

As written.

(10-10-2014 07:04 PM)Dieter Wrote:
(10-10-2014 08:23 AM)walter b Wrote:  (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.

I think that's the reason the light year was defined based on an average year per convention. And it's just a yardstick for measuring distances in the universe, so who cares about deviations less than 10^(-4)? Has anybody an idea, however, why they took the Julian instead of the Gregorian year? The latter would have been more consistent IMHO but I'm no astronomer.

d:-)
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 Messages In This Thread WP 34S conversion error - Peter Van Roy - 10-09-2014, 06:01 PM RE: WP 34S conversion error - Paul Dale - 10-09-2014, 09:37 PM RE: WP 34S conversion error - Gerson W. Barbosa - 10-10-2014, 03:08 AM RE: WP 34S conversion error - walter b - 10-10-2014, 08:27 AM RE: WP 34S conversion error - Dieter - 10-10-2014, 05:57 AM RE: WP 34S conversion error - walter b - 10-10-2014, 08:23 AM RE: WP 34S conversion error - Marcus von Cube - 10-10-2014, 02:09 PM RE: WP 34S conversion error - Dieter - 10-10-2014, 07:04 PM RE: WP 34S conversion error - walter b - 10-10-2014 07:44 PM RE: WP 34S conversion error - walter b - 12-09-2014, 07:03 AM RE: WP 34S conversion error - walter b - 01-05-2015, 08:13 PM RE: WP 34S conversion error - Didier Lachieze - 01-05-2015, 10:13 PM RE: WP 34S conversion error - Dieter - 01-07-2015, 07:34 PM RE: WP 34S conversion error - Wolfgang - 11-11-2014, 10:30 PM

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