Re: LightYear Conversion is Incorrect in Units Package
- To: mathgroup at smc.vnet.net
- Subject: [mg28627] Re: LightYear Conversion is Incorrect in Units Package
- From: "Urijah Kaplan" <uak at sas.upenn.edu>
- Date: Wed, 2 May 2001 03:37:20 -0400 (EDT)
- Organization: University of Pennsylvania
- References: <9cle01$18s@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
The plot thickens...it seems that Mathematica uses a year of 365.24219 days or so, but the National Institute of Science and Technology says (see http://physics.nist.gov/Pubs/SP811/contents.html page 64 of the pdf or you can find it at http://physics.nist.gov/Pubs/SP811/appenB8.html ) mandates that for this purpose, a year is 365.25 days, which makes a light year 9.4607*^15*Meter, which is different from what Mathematica says. So it is a bug!