[Kstars-devel] Review Request 113019: Update moon position code to Meeus 1998 and fixed bug in Time calculator->Almanac

[Aleksey Khudyakov]

> On Dec. 7, 2013, 5:53 p.m., Rafal Kulaga wrote:
> > Ship it, but I think it would make sense to use pow() instead of series of multiplication operators.

I would expect pow to be much slower than multiplication. Also to my knowledge most efficient method for evaluation of polynomials is Horner's algorithm. http://en.wikipedia.org/wiki/Horner%27s_method


- Aleksey


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On Oct. 9, 2013, 12:06 a.m., Vijay Dhameliya wrote:
> 
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> http://git.reviewboard.kde.org/r/113019/
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> 
> (Updated Oct. 9, 2013, 12:06 a.m.)
> 
> 
> Review request for KStars, Akarsh Simha, Henry de Valence, and Rafal Kulaga.
> 
> 
> Repository: kstars
> 
> 
> Description
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> 
> As such there are no major changes made in Moon Position algorithm in Meeus 1998 from Meeus 1991 but few constants are modified which increases accuracy by few arc-seconds. 
> 
> Previously Tools->Calculator->Time Calculators->Almanac always produced phase unknown which is fixed by calling findPosition() and findPhase() before calling illum(). 
> 
> 
> Diffs
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> 
>   kstars/skyobjects/ksmoon.cpp ac7e4ed 
>   kstars/tools/modcalcdaylength.cpp b11cca2 
> 
> Diff: http://git.reviewboard.kde.org/r/113019/diff/
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> 
> Testing
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> 
> Tools->Calculator->Time Calculators->Almanac produces correct phase.
> 
> 
> Thanks,
> 
> Vijay Dhameliya
> 
>

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