Because of Sun/SSB wobble, can't use slope solver to find
Neptune apsides. Added special case logic to find them
using more of a brute force algorithm.
Unit tests now pass, but require very loose tolerances
for the outer planets.
I will have to adjust the model generator to create
more accurate heliocentric distance models for the VSOP
planets, and more accurate Chebyshev polynomials for Pluto.
This will be a judgment call to balance accuracy versus code size.
Use planet apsis test data generated by generate.c to verify
Astronomy Engine calculations. Currently this fails for Neptune
as expected. Will fix that in a future commit.
Implemented a more efficient function Astronomy_HelioDistance
for calculating heliocentric distances of the planets
Mercury through Neptune: use VSOP distance formula only.
For Moon and Pluto, fall back to calculating heliocentric
vector and then finding the length of that vector.
Added function Time.Parse to convert a UTC date/time string
into a Time object. People should not have to keep reinventing
that wheel. I will be able to simplify astro_demo_common.py.
Removed redundant refraction calculations from Astronomy.Horizon().
Added a unit test that InverseRefractionAngle() converges and calculates
an accurate inverse of RefractionAngle().
More work on new functions for converting orientation systems.
Changed a few classes to structs for memory allocation efficiency.
Moved stuff around in astronomy.cs so the Astronomy class comes
last. This is helpful when I want to add new functions, so I
don't have to search for the end of the class.
Starting to work on rotation functions in C#.
Added class RotationMatrix.
Split precession() into precession() and precession_rot().
Fixed problem in csdown handling type double[3,3].
Currently I ignore any errors when checking the C# documentation,
because there are broken links for the rotation functions I
haven't started adding yet. I will turn that error check back on
once I finish those functions.
pydown.py now searches description text for internal links
and expands them properly for Markdown file README.md.
For example: "#Body" ==> "[`Body`](#Body)".
Fixed a couple of incorrect "Astronomy_..." names in Python docs.
Never use pound-signs inside documentation for Python return types.
Automatically create internal link just like for function parameter types.
Added special case logic in pydown.py for "Time or `None`".
Fixed minor documentation mistakes in JS version.
Separate the calculation of refraction angle from the Horizon function.
Added missing documentation for the parameters of the Horizon function.
Added definition of class Spherical. Not yet used, but soon will be.
Instead of having the same calculations duplicated in both
nutation() and nutation_rot(), I reworked nutation() in terms of
nutation_rot(). Use nutation_rot() to calculate the rotation matrix,
then multiply that matrix by the input vector to produce the output vector.
The gcc-6 compiler in travis-ci has changed its behavior.
It is warning that 'fmid' local variable in Search() may
be used uninitialized. I believe it is safe but I'm adding
an initialization to fmid to make the warning go away.
I need a way to undo a refraction correction:
given a post-refraction altitude, find the unrefracted
altitude that leads to it. Starting to write the code.
Not finished yet.
