Montag, 17. September 2012

Libration: a song

 Dieses unglaublich coole Video zeigt in einer Animation für jede Stunde in 2012 die exakte Mondphase. Im Zeitraffer kann man die so genannte Libration sehr gut beobachten. Und dazu bekommt man auch noch eine gesungene Erklärung von der Mezzo-Sopranistin Hai-Ting Chinn, begleitet von Erika Switzer am Klavier.


This is animation.
Each frame represents one hour;
the whole, one year.
The moon keeps the same face to us,
but not exactly the same face.
Because of the tilt and shape of its orbit
we see the moon from slightly different angles.
In a time lapse it looks like it's wobbling.
This is libration.
That rocking and tilting is real,
it's called libration.

The moon's orbit is not a circle,
but an ellipse.
The speed varies,
but the spin is constant.
Together these geometries
let us look East a little more,
then West a little more.
And the orbit's tilt
let's us look South a little more,
then North a little more.
This is libration.
The moon's libration.

Libration
Hai-Ting Chinn, voice http://hai-ting.com
Erika Switzer, piano http://erikaswitzer.ca
-Music by Matthew Schickele http://matthewschickele.com
-Lyrics adapted with permission from texts by NASA/Goddard Space Flight Center http://svs.gsfc.nasa.gov
and Dr. Phil Plait http://badastronomy.com

Via Bad Astronomy,
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