اندers Celsius was a Swedish astronomer and physicist, best known for creating the Celsius scale for measuring temperature. He developed this scale in 1742, where 0 degrees represents the freezing point of water and 100 degrees represents the boiling point at standard atmospheric pressure. Celsius's work laid the foundation for modern temperature measurement, and his scale is widely used around the world today. The Celsius scale is part of the metric system and is commonly used in scientific contexts, as well as in everyday life for weather forecasts and cooking.