Vel lux vel sonus

L'armonia del mondo

Keplero

SN 1604, Kepler's Supernova

*

"Duo sunt, quae nobis harmonias in rebus naturibus patefaciunt,

vel lux vel sonus"

Harmonice Mundi, liber V caput IV

*

Astronomy Picture of the Day - 2004 October 8 - NASA

Explanation: Light from the stellar explosion that created this energized cosmic cloud was first seen on planet Earth in October 1604, a mere four hundred years ago. The supernova produced a bright new star in early 17th century skies within the constellation Ophiuchus. It was studied by astronomer Johannes Kepler and his contemporaries, with out the benefit of a telescope, as they searched for an explanation of the heavenly apparition. Armed with a modern understanding of stellar evolution, early 21st century astronomers continue to explore the expanding debris cloud, but can now use orbiting space telescopes to survey Kepler's supernova remnant (SNR) across the spectrum. In this tantalizing composite image, x-rays, visible light, and infrared radiation recorded by NASA's astrophysical observatories - the Chandra X-Ray Observatory, Hubble and Spitzer space telescopes - are combined to give a more comprehensive view of the still enigmatic supernova remnant. About 13,000 light years away, Kepler's supernova represents the most recent stellar explosion seen to occur within our Milky Way galaxy.

I Solidi Stellati

lunedì, 08 ottobre 2007

I Solidi Stellati

Le Stelle di Escher

Stelle 1948

Stelle 1948

I Quattro Solidi Stellati di Keplero-Poinsot 

Il Piccolo Dodecaedro Stellato di Paolo Uccello sul pavimento di San Marco a Venezia

Harmonices Mundi

Harmonices Mundi

di Johannes Kepler

Nel 1619 Johannes Kepler pubblicò Harmonices mundi, le Armonie del mondo.

Nell'opera, che aveva già completato nel 1618, espose la sua terza legge del moto planetario e teorizzò la relazione tra le leggi armoniche dei suoni e i movimenti dei pianeti.

Le suggestioni del modello pitagorico e delle idee platoniche dell'universo operano ancora nel sogno di individuare l'armonica relazione tra gli elementi del cosmo.



Link: Posner Memorial Collection in Electronic Format - Harmonices mundi ("The Harmony of the Worlds") in fulltext facsimile; Carnegie-Mellon University