On Wed, 12 Apr 2000, Robert Terwilliger wrote:
>Hi All,
>
>Comment: I think the problem with rotating or skewing text in graphics
>files could be solved if the text character entities could be converted
>into the vector lines and curves which make them up. I don't think this
>is easy to do with True Type fonts.
>
>Question: Is there a source, or value, for the exact inclination of the
>earth's axis? I understand it is decreasing slightly. The last value I
>used was 23.4385 degrees. I cannot remember where I got it.
The obliquity of the ecliptic at J2000.0 is 23.4393 degrees (or, to more
precision, 84381.412 arc seconds with an uncertainty of 5 milli-arc seconds).
This is the value associated with the JPL DE403/LE403 planetary and lunar
ephemerides. There is a variation in the obliquity due to the nutation of the
earth's rotation axis. And also longer term variations due to the
purturbation of the earth's orbit by the other members of the solar system.
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Richard B. Langley E-mail: [EMAIL PROTECTED]
Geodetic Research Laboratory Web: http://www.unb.ca/GGE/
Dept. of Geodesy and Geomatics Engineering Phone: +1 506 453-5142
University of New Brunswick Fax: +1 506 453-4943
Fredericton, N.B., Canada E3B 5A3
Fredericton? Where's that? See: http://www.city.fredericton.nb.ca/
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