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Piscis Austrinus is a constellation bordered by Capricornus to the northwest, Microscopium to the southwest, Grus to the south, Sculptor to the east, Aquarius to the north. Its recommended three-letter abbreviation, as adopted by the International Astronomical Union in 1922, is "PsA". Ptolemy called the constellation "Ichthus Notios" "Southern Fish" in his "Almagest"; this was Latinised to Piscis Notius and used by German celestial cartographers Johann Bayer, and Johann Elert Bode. Bayer also called it Piscis Meridanus and Piscis Austrinus, while French astronomer Nicolas-Louis de Lacaille called it Piscis Australis. English Astronomer Royal John Flamsteed went with Piscis Austrinus, which was followed by most subsequently. The official constellation boundaries, as set by Belgian astronomer Eugène Delporte in 1930, are defined by a polygon of four segments ("illustrated in infobox"). In the equatorial coordinate system, the right ascension coordinates of these borders lie between and , while the declination coordinates are between -24.83° and -36.46°. The whole constellation is visible to observers south of latitude 53°N.