.. _cpp_ex9_ephemeris:

Example 9: Ephemeris and LansAlmanac Fitting
========================================

Study the accuracy-vs-broadcast-datasize trade-off of two lunar-satellite orbit
models fit to a numerically propagated truth trajectory: a precise, short-validity
``LansEphemeris`` (Chebyshev) and a coarse, long-validity ``LansAlmanac``
(Algorithm 2 of Iiyama & Gao). The scenario is built from ``configs/ephemeris.yaml``
(a thin ``EphemerisManager`` agent hosting an ``EphemerisApp``) and run with
``Simulation``; the app fits both models over a sweep of fitting-window lengths,
reporting RMS / 95th-percentile RTN position and velocity error and the minimum
broadcast bit budget for a target position accuracy.

Mirrors :doc:`../Python/ex9_ephemeris`.

.. literalinclude:: ../../../cpp/examples/tutorials/ex9_ephemeris.cc
   :language: cpp

.. code-block:: bash

   pixi run build-examples
   ./build-examples-pixi/ex9_ephemeris