# Two-Line Element Sets and SGP-4


```{eval-rst}
.. autoclass:: satkit.TLE
   :members:
    :exclude-members: from_file, from_lines, fit_from_states, to_2line, to_3line
   :undoc-members:
   :show-inheritance:
   :inherited-members:

.. automethod:: satkit.TLE.from_file
    :no-index:

.. automethod:: satkit.TLE.from_lines
    :no-index:

.. automethod:: satkit.TLE.fit_from_states
    :no-index:

.. automethod:: satkit.TLE.to_2line
    :no-index:

.. automethod:: satkit.TLE.to_3line
    :no-index:

.. autoclass:: satkit.sgp4_opsmode
    :members:
    :undoc-members:
    :show-inheritance:
    :inherited-members:

.. autoclass:: satkit.sgp4_gravconst
    :members:
    :undoc-members:
    :show-inheritance:
    :inherited-members:

.. autofunction:: satkit.sgp4
```