Anders Johan Lexell Anders Johan Lexell Anders Johan Lexell (24 December 1740 – ) was a Finnish-Swedish astronomer, mathematician, and physicist who spent most of his life in Imperial Russia, where he was known as Andrei Ivanovich Leksel (Андрей Иванович Лексель). Lexell made important discoveries in polygonometry and celestial mechanics; the latter led to a comet named in his honour. La Grande Encyclopédie states that he was the prominent mathematician of his time who contributed to spherical trigonometry with new and interesting solutions, which he took as a basis for his research of comet and planet motion. His name was given to a
Celsius (crater) Celsius with Celsius A. The interior floor of Celsius is almost featureless, except for a small craterlet in the northern half. By convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint that is closest to Celsius. 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