The Moon always 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 over the course of a month. When a month is compressed into 24 seconds, as it is in this animation, our changing view of the Moon makes it look like it's wobbling. This wobble is called libration.
The word comes from the Latin for "balance scale" (as does the name of the zodiac constellation Libra) and refers to the way such a scale tips up and down on alternating sides.
The most noticed monthly variation in the Moon's appearance is the cycle of phases, caused by the changing angle of the Sun as the Moon orbits the Earth. The cycle begins with the waxing (growing) crescent Moon visible in the west just after sunset. By first quarter, the Moon is high in the sky at sunset and sets around midnight. The full Moon rises at sunset and is high in the sky at midnight. The third quarter Moon is often surprisingly conspicuous in the daylit western sky long after sunrise.
GIF animation: Wikimedia Commons: http://goo.gl/UX2zRb
US and British spy agencies routinely try to gain access to personal data from Angry Birds and other mobile applications. A National Security Agency (NSA) document shows location, websites visited and contacts are among the data targeted from mobile applications. It is the latest revelation from documents leaked by Edward Snowden.
UK spy agency intercepted webcam images of millions of Yahoo users
• Optic Nerve program collected Yahoo webcam images in bulk • 1.8m users targeted by GCHQ in six-month period alone • Yahoo: 'A whole new le
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Picasa Web Albums - Ross Becker - Christchurch ...
Photos by Ross Becker, Jul 7, 2011 - The pace of demolition in the CBD red zone has really picked up, almost to feaver pitch with huge digge