Re: LightYear Conversion is Incorrect in Units Package
- To: mathgroup at smc.vnet.net
- Subject: [mg28620] Re: LightYear Conversion is Incorrect in Units Package
- From: Adam Smith<adam.smith at hillsdale.edu>
- Date: Wed, 2 May 2001 03:37:11 -0400 (EDT)
- References: <9cle01$18s@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
The value for a LightYear=9.4605*^15*Meter is correct. The value 1.0Year SpeedOfLight = 9.454254955488*^15*Meter is for a 365 day year. The 9.4605*^15 value takes into account the fact that a year is not exactly 365 days but about 365.25 days - Hence the extra day every four years to correct for this. Adam Smith In article <9cle01$18s at smc.vnet.net>, David Park says... > >Dear MathGroup, > >The LightYear conversion appears to be significantly incorrect in the Units >package. > >Needs["Miscellaneous`Units`"] >Needs["Miscellaneous`PhysicalConstants`"] > >{Convert[LightYear, Meter], Convert[1.0Year SpeedOfLight, Meter]} >{9.4605*^15*Meter, 9.454254955488*^15*Meter} > >I believe that the second value is the correct value. If you agree, you can >correct the Miscellaneous`Units` package by searching for LightYear and >pasting in the correct value. > >David Park >djmp at earthlink.net >http://home.earthlink.net/~djmp/ > >