Nicolai Reymers Baer

Nicolaus Reimers Baer (2 February 1551 – 16 October 1600), also Reimarus Ursus, Nicolaus Reimers Bär or Nicolaus Reymers Baer, was an astronomer and imperial mathematician to Emperor Rudolf II. Due to his family's background, he was also known as Bär, Latinized to Ursus ("bear").