Why do so many star names, like Aldebaran and Betelgeuse, sound Arabic?
Betelgeuse begins with a medieval misreading: in the 13th century one Arabic letter was taken for another that differs only in its dots, and the mistake became the star's name.
▶ Start the storyMany star names sound Arabic because they are Arabic. In Western astronomy most of the accepted star names are Arabic, a few are Greek, and some are of unknown origin. The reason is a chain of books. Ptolemy's was translated into Arabic in the 8th and 9th centuries, and it became famous in Europe through a Latin translation in the 12th century. Many of its Arabic star descriptions came to be widely used as star names.
Aldebaran is a good example. The name derives from the Arabic al Dabarān, meaning the follower, because the star seems to follow the across the sky. Betelgeuse comes from the Arabic for the hand of .
But Betelgeuse is also a lesson in how names get damaged. In Europe, writers who did not know Arabic well often copied or translated star names wrongly. In the 13th century the first Arabic letter of the name was misread as another letter that differs from it only by its dots. That slip led to the European name Betelgeuse, so the beginning of its name is, in effect, a medieval typo.
Step 1: 2nd century
Ptolemy's catalogues the stars
Step 2: 8th–9th centuries
It is translated into Arabic
Step 3: Around 964
Al-Sufi writes the
Step 4: 12th century on
Latin copies reach Europe, with slips along the way
Step 5: 2016
The IAU makes many Arabic names official
In 2016 the gave stars official names to end the confusion of different naming systems, and many stars kept the commonly used Arabic name. So when you point at Aldebaran, you are using a word that crossed the Mediterranean, passed through scribes, and is still alive in the sky.
Quiz me
0/3
Recap
Star names are Arabic because Arabic astronomers kept, improved and renamed the sky, and Europe borrowed it, typos included.
💡 A trick to remember it · Al-Dabaran, the Follower, trails the Pleiades; Betelgeuse, the Hand, lost a dot and kept the wrong name.
Surprising fact · Betelgeuse owes its beginning to a medieval misreading of a single Arabic letter.
Sources (4)
No source, no claim. Every fact in this lesson (15 claims) cites at least one of these.