Proper motion Wikipedia audio article Wikipedia audio article

This is an audio version of the Wikipedia Article: Proper motion Wikipedia audio article Listening is a more natural way of learning when compared to reading. Written language only began at around 3200 BC but spoken language has existed long ago. Learning by listening is a great way to: - increases imagination and understanding - improves your listening skills - improves your own spoken accent - learn while on the move - reduce eye strain Now learn the vast amount of general knowledge available on Wikipedia through audio audio article. You could even learn subconsciously by playing the audio while you are sleeping! If you are planning to listen a lot you could try using a bone conduction headphone or a standard speaker instead of an earphone. You can find other Wikipedia audio articles too at: In case you dont find one that you were looking for put a comment. This video uses Google TTS en-US-Standard-D voice. SUMMARY Proper motion is the astronomical measure of the observed changes in the apparent places of stars or other celestial objects in the sky as seen from the center of mass of the Solar System compared to the abstract background of the more distant stars.The components for proper motion in the equatorial coordinate system of a given epoch often J2000.0 are given in the direction of right ascension μα and of declination μδ. Their combined value is computed as the total proper motion μ. It has dimensions of angle per time typically arcseconds per year or milliarcseconds per year. Knowledge of the proper motion distance and radial velocity allows calculations of true stellar motion or velocity in space in respect to the Sun and by coordinate transformation the motion in respect to the Milky Way. Proper motion is not entirely proper that is intrinsic to the celestial body or star because it includes a component due to the motion of the Solar System itself.,

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