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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: [mg28617] Re: [mg28605] LightYear Conversion is Incorrect in Units Package
  • From: BobHanlon at aol.com
  • Date: Wed, 2 May 2001 03:37:08 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

The difference is due to the meaning of Year.

Convert[Year, Day]

365*Day

Convert[Convert[LightYear, Meter]/SpeedOfLight, Day]

365.24110215533767*Day


Bob Hanlon

In a message dated 2001/5/1 12:42:17 AM, djmp at earthlink.net writes:

>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.
>


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