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The Stars Illumination Calculator will calculate the:

- Illumination (brightness) of a star S
_{2}if the apparent magnitude and illumination of another reference star S_{1}as well as the illumination of the star S_{1}are known.

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

Illumination of the unknown star (b_{2}) [lux] |

Illumination of the unknown star calculation |
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b_{2} = b_{1} ∙ 10^{0.4 ∙ (m1 - m2 )}b _{2} = ∙ 10^{0.4 ∙ ( - )}b _{2} = ∙ 10^{0.4 ∙ }b _{2} = ∙ 10^{}b _{2} = ∙ b _{2} = |

Stars Illumination Calculator Input Values |

Apparent magnitude of the reference star (m_{1}) [] |

Apparent magnitude of the unknown star (m_{2}) [] |

Illumination of the reference star (b_{1}) [lux] |

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

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b_{2} = b_{1} ∙ 10^{0.4 ∙ (m1 - m2 ) }

This formula derives from:

m_{1} - m_{2} = -2.5 log *b*_{1}*/**b*_{2}

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.

- 22.1 - Earth and Other Celestial Bodies
- 22.2 - Sun and Planetary Motion
- 22.3 - The Moon's Movement. Eclipses. Calendars
- 22.4 - Stars
- 22.5 - Evolution of Stars
- 22.6 - Galaxies and Hierarchic Structures in the Universe
- 22.7 - Astronomical Measurements and Observations
- 22.8 - Orientation in the Sky and Constellations
- 22.9 - Expansion of the Universe
- 22.10 - Big Bang Model and Temperature
- 22.11 - Chronology of the Universe
- 22.12 - Formation of Galaxies and Solar System. Actual Problems

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