March 8, 1618 Kepler announces his third law

On this day (March 8) 1618 Kepler announces his third law
Johannes Keplerwas born on December 27, 1571 and was a German astronomer , mathematician , and astrologer . He is a key figure in the scientific revolution of the 17th century, best known for his laws of planetary motion and his popular books.
The Third Law says that "For any planet, the square of its orbital period is directly proportional to the cube of the length of the semimajor axis of its elliptical orbit"
or also
"The square of the periods of the orbit of celestial bodies is proportional to the cube of the distance from the Sun."
Where, "T" is the orbital period (time it takes to go around the Sun once), "a" the mean distance of the planet from the Sun and "C" the proportionality constant. These laws apply to other astronomical bodies that are in mutual gravitational influence, such as the system formed by the Earth and the sun.
The Kepler's Third Law is published in the book Harmonices Mundi . In the work, written entirely in Latin, Kepler discusses harmony and congruence in geometric shapes and physical phenomena. The so-called " third law of planetary motion ", of which he does not give many explanations about his conclusion, is in the final section of the book.
As a curiosity to comment that Kepler was convinced "that geometric things have provided the Creator with the model to decorate the entire world"
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- the town crier, the town crier... he makes himself knoweeeeerrr by Mr. Kepleeerrrrr...
- Kepler...
- .. the third law of Kepleeeeerrrrr...
- please Kepler
- ... and it sayseeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee.... The squaring of the periods of the orbiteeeeeeeeeeeeee....
- Kepler, enough...
-... of the heavenly bodies it is proportional to the cube of the distance there is with respect to the Sooooooooooool.
- Kepler...
- what? Did you like it?
- Kepler, you can't announce your law like a normal person
- it's just that I wanted to announce it as a preginero
- why?
- it's funnier, more impactful... I think they call it "marketing"

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