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Post Info TOPIC: Libration


L

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RE: Libration
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Maximum southerly lunar libration is at 08:45 UT, 18th March 2017. 

libration180317



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L

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Maximum easterly lunar libration is at 03:53 UT, 11th March 2017.

libration110317

(Look towards Mare Smythii)



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L

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Maximum westerly lunar libration is at 08:04 UT, 25th February 2017.

(Look towards Lacus Autumni)

libration250217



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L

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Lunar libration
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Maximum easterly lunar libration is at 08:24 UT, 20th November 2016.
(Look towards Mare Crisium in earthshine).

The next most easterly lunar libration is on the 13th October 2139.
The last most easterly lunar libration was on the 9th November 1998.



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L

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Libration
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Maximum southerly lunar libration is at 09:17 UT, 19th June 2016. Look towards the lunar South Pole.

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Moon Phase and Libration



The animation archived on this page shows the geocentric phase, libration, position angle of the axis, and apparent diameter of the Moon throughout the year 2011, at hourly intervals. The Current Moon image is the frame from this animation for the current hour.
This marks the first time that accurate shadows at this level of detail are possible in such a computer simulation. The shadows are based on the global elevation map being developed from measurements by the Lunar Orbiter Laser Altimeter (LOLA) aboard the Lunar Reconnaissance Orbiter (LRO). LOLA has already taken more than 10 times as many elevation measurements as all previous missions combined.
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 12 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 sub-Earth point gives the amount of libration in longitude and latitude. The sub-Earth point is also the apparent center of the Moon's disk and the location on the Moon where the Earth is directly overhead.
Credit: NASA/Goddard Space Flight Centre Scientific Visualisation Studio



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