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The Planets Realignment Time Calculator will calculate the:

- The time needed for an inner planet (Mercury or Venus) to realign with Earth when the periods of revolution are known
- The time needed for an outer planet (Mars, Jupiter, Saturn, Uranus or Neptune) to realign with Earth when the periods of revolution are known

**Calculation Parameters:** The formula is valid only for the planets of Solar System

Time needed for an inner planet to realign with Earth d [days] |

Time needed for an outer planet to realign with Earth d [days] |

Time needed for an inner planet to realign with Earth calculation calculation |
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θ_{i} = T_{p} × T_{E}/T_{E} - T_{p}θ _{i} = × / - θ _{i} = /θ _{i} = |

Time needed for an outer planet to realign with Earth calculation calculation |

θ_{i} = T_{p} × T_{E}/T_{p} - T_{E}θ _{i} = × / - θ _{i} = /θ _{i} = |

Planets Realignement Time Calculator Input Values |

Period of planet's revolution (T_{p}) d [days] |

Period of Earth revolution (T_{E}) d [days] |

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

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Section 2: Vectors and Scalars

θ_{i} = *T*_{p} × T_{E}*/**T*_{E} - T_{p}

This formula derives from

1/θ_{i} = *1**/**T*_{p} - *1**/**T*_{E}

θ_{i} = *T*_{p} × T_{E}*/**T*_{p} - T_{E}

This formula derives from

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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