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BeginnerBorn on the Cusp? Why You Still Have Exactly One Sun Sign
Sign dates shift by up to a day from year to year, which is where the cusp idea comes from. But at your birth moment the Sun stood at one degree, and one degree falls in one sign.
5 min read·Aug 7
BeginnerSacrobosco's De Sphaera: the textbook that mapped the medieval cosmos
How a short 13th-century textbook taught Europe the geometry of the sky shared by astrology and astronomy for 400 years.
7 min read·Jun 24
BeginnerThe 88 Constellations: From Ptolemy's 48 to the Modern Sky
The night sky is officially divided into 88 constellations, fixed regions set by the International Astronomical Union in 1922 with borders drawn by Eugene Delporte and published in 1930. The system grew from Ptolemy's 48, listed in the Almagest in the 2nd century CE.
6 min read·Jun 6