Axel Anthon Bjørnbo

Axel Anthon Bjørnbo born Christensen (April 20, 1874 – October 6, 1911) was a Danish librarian and historian of mathematics and cartography.

He took on the surname Bjørnbo in 1901 as names ending in -sen like "Christiansen" were regarded with too high status.

He examined Arabic trigonometric works in collaboration with Rasmus Olsen Besthorn and Hebrew texts with David Simonsen and published his studies on Menelaus of Alexandria's spherics in 1902 and received a doctorate.

[1] He became a librarian in 1902 at the Royal Library at Copenhagen also became interested in cartography in the Middle Ages after discovering a manuscript work by Claudius Clavus.

This work on Greenlandic mapping before 1576 was published posthumously as Cartographia Groenlandica.