This is an audio version of the Wikipedia Article: Harvard Revised catalogue | 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: https://www.youtube.com/channel/UCuKfABj2eGyjH3ntPxp4YeQ In case you don't find one that you were looking for, put a comment. This video uses Google TTS en-US-Standard-D voice. SUMMARY ======= The Bright Star Catalogue, also known as the Yale Catalogue of Bright Stars or Yale Bright Star Catalogue, is a star catalogue that lists all stars of stellar magnitude 6.5 or brighter, which is roughly every star visible to the naked eye from Earth. The catalog contains 9,110 objects, of which 9,095 are stars, 11 are novae or supernovae, and 4 are non-stellar objects; the non-stellar objects are the globular clusters 47 Tucanae (designated HR 95) and NGC 2808 (HR 3671), and the open clusters NGC 2281 (HR 2496) and Messier 67 (HR 3515).The catalogue is fixed in number of entries, but its data is maintained, and it is appended with a comments section about the objects that has been steadily enhanced since the Yale astronomer Frank Schlesinger published the first version in 1930. The version of 1991 was the fifth in order, a version that implied a considerable enhancement of the comments section, to a little more than the size of the catalogue itself. This most recent edition, in addition to several previous editions, was compiled and edited by Ellen Dorrit Hoffleit of Yale University.Although the abbreviation for the catalog is BS or YBS, citations of stars indexed in the catalog use HR before the catalog number, after the catalog's 1908 predecessor, the Harvard Revised Photometry Catalogue produced by the Harvard College Observatory. The original Harvard Photometry was published in 1884 by Edward Charles Pickering, which contained about 4,000 stars. Following its release, Pickering promoted a broader stellar survey that would include stars from the southern celestial hemisphere. This photometry work was carried out by Solon I. Bailey between 1889 and 1891, leading to the publication of the Revised Harvard Photometry in 1908. The new catalogue contained stars down to magnitude 6.5 in both hemispheres. The work was then continued by John A. Parkhurst up through the 1920s.

• published: 18 Nov 2018
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