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The Apparent Magnitude of Stars Calculator will calculate the:

- Apparent magnitude of a star when its illumination (brightness) is known

**Calculation Parameters:** None of the values can be zero

Apparent magnitude of the star (m) |

m = -2.5 log b - 19 m = -2.5 × log( ) - 19m = -2.5 × - 19m = |

Apparent Magnitude Of Stars Calculator Input Values |

Illumination of the star (b) lux |

Please note that the formula for each calculation along with detailed calculations are available below. As you enter the specific factors of each apparent magnitude of stars calculation, the Apparent Magnitude Of Stars Calculator will automatically calculate the results and update the Physics formula elements with each element of the apparent magnitude of stars calculation. You can then email or print this apparent magnitude of stars calculation as required for later use.

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m = -2.5 log b - 19

The following Physics tutorials are provided within the Cosmology section of our Free Physics Tutorials. Each Cosmology tutorial includes detailed Cosmology formula and example of how to calculate and resolve specific Cosmology questions and problems. At the end of each Cosmology tutorial you will find Cosmology revision questions with a hidden answer that reveals when clicked. This allows you to learn about Cosmology and test your knowledge of Physics by answering the test questions on Cosmology.

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- 22.2 - Sun and Planetary Motion
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