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StarDate  

StarDate

Your guide to the universe

Author: Billy Henry

StarDate, the longest-running national radio science feature in the U.S., tells listeners what to look for in the night sky.
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Language: en-us

Genres: Astronomy, Education, Science

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Moon and Gemini
Tuesday, 19 May, 2026

The Moon lines up with the twins of Gemini this evening – the stars Pollux and Castor. Pollux is the brighter twin, and is closer to the Moon. The brilliant planet Jupiter is to the lower right of the Moon. Gemini has been around for thousands of years. Its roots trace back to ancient Babylon, as do those of many other constellations. All of them were recorded in one of the most important works of astronomy in the ancient world. Known as the Almagest, it was written by Claudius Ptolemy around the year 150. Ptolemy studied many fields, including astronomy, astrology, geology, and music theory. The Almagest is perhaps his most famous work. In it, he recorded the positions of a thousand stars, and included details on the motions of the Sun, Moon, and planets. He also discussed everything from eclipses to the length of the year. The book listed 48 constellations that were visible from northern skies – Gemini among them. The constellations weren’t given any borders – just the regions of the sky in which they appeared. And some barren regions weren’t part of any constellation. Over the centuries, astronomers shifted things around some. And they created constellations for southern skies as well. Finally, in 1930, they created an “official” list of 88 constellations. Each one was given precise borders. That gave every star a home – its own “address” in the universe. Script by Damond Benningfield

 

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