.. currentmodule:: mubody.coordinates.frames

Frames
======

In order to describe an orbit or a trajectory in space, we first need to define a suitable reference system. Normally, right-handed cartesian frames are used for this purpose. A cartesian frame is defined by specifying its origin and three orthogonal directions.

* Origin: this point serves as the reference point for all measurements within the frame. The coordinates of this point will be (0, 0, 0) in the frame.
* Axes: determine the orientation and directions of the coordinate axes. As they are mutually orthogonal, two directions are enough to define the triplet.

In mubody, coordinate frames are represented by  :class:`Frame`:


.. autosummary::
   :toctree: _autosummary/

   Frame
   ICRF
   GCRF
   MIRF
   RotatingFrame
   SynodicFrame