**Observational Astronomy**
===========================



.. py:currentmodule:: symplyphysics.astronomy.observational_astronomy

**Contents:**

.. toctree::
    :maxdepth: 4


    astronomy.observational_astronomy.absolute_magnitude_from_apparent_magnitude_and_distance
    astronomy.observational_astronomy.change_in_apparent_magnitude_from_distance
    astronomy.observational_astronomy.luminosity_of_star_from_absolute_magnitude
    astronomy.observational_astronomy.ratio_of_luminosities_from_ratio_of_masses_of_stars