04 Feb, 2018. Greeting Ginan 📚 In 1603 the German astronomer Johann Bayer published his “Uranometria”, a catalogue of over 1200 stars visible from both the northern and southern hemispheres. Bayer’s work saw the introduction of a system of listing stars based on their brightness within their respective constellations. The brightness category was indicated by a letter of the Greek alphabet, starting with α (Alpha) for the most luminous star in a constellation, through to ω (Omega) for the dimmest. The Latin name of each constellation was used to indicate in which part of the sky the star was located. 🌟✨ For example, the brightest star in the earth’s night skies, Sirius, is also the brightest star in the constellation of Canis Major (the big dog). Sirius is referred to by astronomers as “Alpha Canis Majoris”, α CMa. In today’s photo, I have added the Greek letters to show the five brightest stars in the constellation of Crux, aka “The Southern Cross”. In English, these are Alpha, Beta, Gamma, Delta and Epsilon Crucis. 🔭 In 2016 the International Astronomical Union (IAU) began recognising more common names for stars, from many cultures around the world. Four of the names of the latest eighty-six stars added to the official list come from the traditions of two of Australia’s indigenous peoples. The fifth-brightest star in Crux, Epsilon Crucis, has been named as Ginan, the traditional name used by the Wardaman people of Australia’s Northern Territory. I have circled Ginan in the photo to show its position in the Southern Cross. Given that Australia’s indigenous peoples have a sophisticated history in astronomy, it is very pleasing to see some worldwide official recognition of their knowledge and practices. 📷 I shot this image with a Canon EOS 6D Mk II camera, Canon 50mm lens @ f/2.2, 5.0 sec exposure @ ISO 6400. • • • • • @astro_photography_ @space @universe247 # plz double tab if you love it . . via @nightscapades .