Oh ! la grotte PDF

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Login to Loopia Customer zone and actualize your plan. Register domains at Loopia Protect your company name, brands and ideas as domains at one of the largest domain providers in Scandinavia. Our full-featured web hosting packages include everything you need to get started with your website, email, blog and online store. Ever since people first wandered the Earth, great significance has been given to the celestial objects seen in the sky. Throughout human history and across many different cultures, names and mythical stories have been attributed to the star patterns in the night sky, thus giving birth to what we know as constellations.

When were the first constellations recorded? Archaeological studies have identified possible astronomical markings painted on the walls in the cave system at Lascaux in southern France. Our ancestors may have recorded their view of the night sky on the walls of their cave some 17 300 years ago. It is thought that the Pleiades star cluster is represented alongside the nearby cluster of the Hyades. Was the first ever depiction of a star pattern made over seventeen millennia ago? Over half of the 88 constellations the IAU recognizes today are attributed to ancient Greek, which consolidated the earlier works by the ancient Babylonian, Egyptian and Assyrian. Forty eight of the constellations we know were recorded in the seventh and eighth books of Claudius Ptolemy’s Almagest, although the exact origin of these constellations still remains uncertain.

Ptolemy’s descriptions are probably strongly influenced by the work of Eudoxus of Knidos in around 350 BC. Originally the constellations were defined informally by the shapes made by their star patterns, but, as the pace of celestial discoveries quickened in the early 20th century, astronomers decided it would be helpful to have an official set of constellation boundaries. One reason was to aid in the naming of new variable stars, which brighten and fade rather than shine steadily. The constellations should be differentiated from asterisms. Asterisms are patterns or shapes of stars that are not related to the known constellations, but nonetheless are widely recognised by laypeople or in the amateur astronomy community.

Constellation Names Each Latin constellation name has two forms: the nominative, for use when talking about the constellation itself, and the genitive, or possessive, which is used in star names. The Latin names of all the constellations, their abbreviated names and boundaries can be found in the table below. The IAU adopted three-letter abbreviations of the constellation names at its inaugural General Assembly in Rome in 1922. So, for instance, Andromeda is abbreviated to And whilst Draco is abbreviated to Dra.