The constellation boundaries were drawn up by EugÃ¨ne Delporte in 1930, and he drew them along vertical and horizontal lines of right ascension and declination.
Twelve of the constellations in the southern celestial hemisphere were not observable by the Greeks, and were created by Dutch navigators Pieter Dirkszoon Keyser and Frederick de Houtman in the sixteenth century and first cataloged by Johann Bayer.
All modern constellation names are Latin proper names or words, and some stars are named using the genitive of the constellation in which they are found.
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