Olof Hiorter Olof Hiorter Olof Petrus (or Peter) Hiorter (or Hjorter) (1696–1750) was a Swedish astronomer. After studying in the Netherlands, he was appointed lecturer at the University of Uppsala in 1732 to fill the vacant position of Anders Celsius then on his grand tour of European observatories. From 1737 onwards, he studied together with Celsius the aurora phenomenon and a number of astronomy subjects (solar eclipse, comet like the one of 1744, latitude measurements). Pehr Wilhelm Wargentin was his pupil. Hiorter was elected a member of the Royal Swedish Academy of Sciences in 1745 and appointed "Observator Regius" - "Royal Astronomer"
Celsius (crater) Celsius (crater) Celsius is a small lunar impact crater that is located in the rugged terrain in the southern hemisphere on the Moon's near side, it is named after Anders Celsius who was the founder of the Celsius temperature system which is part of the Metric system. It lies less than one crater diameter to the south-southwest of the crater Zagut, west of Rabbi Levi, and due north of Büsching. This is a heavily worn crater with a southwest rim that has been damaged by multiple small crater impacts. There is a valley-like gap in the northern rim that joins