the IAU 1980 Nutation algorithm
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21-04-2016, 02:58 PM
Post: #1
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the IAU 1980 Nutation algorithm
This HP Prime program demonstrates how to call a subroutine called nutate80. The nutate80 source code implements the classical IAU 1980 nutation theory.
Here's the syntax of the routine. EXPORT nutate80(jdate) // nutation in longitude and obliquity // IAU 1980 version // input // jdate = julian date // output // vnut(1) = nutation in longitude (arc seconds) // vnut(2) = nutation in obliquity (arc seconds) And here's the output from the program. IAU 1980 NUTATIONS (arc seconds) nutation in longitude 14.4505645343 nutation in obliquity −6.05167374791 The attached zip file also includes a PDF document that provides more information about this algorithm. |
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