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MathGroup Archive 2001

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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/
>
>



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