A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: 12 Feb 2011 Unorthodox Jupiter Lunar from a moving platform
From: Andrés Ruiz
Date: 2011 Mar 15, 14:43 +0100
Hello Paul and Dave,
I have been inspecting the code, in VB,
at http://home.earthlink.net/~s543t-24dst/sofajplNet/LunarDist2.html, but I can not follow it in detail. The fact is that the differential equations, (or its linear approximation), must be solved in radians (and the value of the partial derivatives calculated numerically and analytically is given in these units). Since the conversion factor between degrees/minutes and degrees/radians is almost similar, (
180/pi = 57.29577951 near 60), the results can be distorted and be masked.
The question for you two is: Is the problem solved taking into account this?
2011/3/4 Dave Walden <email@example.com>
Since, as in the previous case, the method I used is an automated verion of Paul's, we can again compare the partials. (I calculated them numerically as opposed to Andres' analytic description. ((I am using NOVAS_F3.0.f)) )
| .000 | | -.498 -.867 -.148 |
| -.005 | | -.728 .685 .117 |
| .002 | | -.554 -.832 -.143 |
| .000 | | -.006 -.016 .006 |
From my calculation, absolute values:
.492 .849 .146
.738 .693 .115
.554 .831 .143
.006 .016 .006
Again, quite reassuring.
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