who worked out the circumference of the earth
Eratosthenes He is best known for being the first person to calculate the circumference of the Earth, which he did by applying a measuring system using stadia, a standard unit of measure during that time period. His calculation was remarkably accurate. He was also the first to calculate the tilt of the Earth's axis (again with remarkable accuracy). Additionally, he may have accurately calculated the distance from the Earth to the Sun and invented the leap day.[4] He created the first map of the world, incorporating parallels and meridians based on the available geographic knowledge of his era.
Harlan Howard Howard formulated the oft-quoted definition of a great country song: "Three chords and the truth."[3]
Gary Oldman Gary Leonard Oldman[1] (born 21 March 1958)[2] is an English actor, filmmaker, musician and author who has performed in theatre, film and television. He is known for his "big" acting style and on-screen diversity.
Exponentiation Any nonzero number raised to the 0 power is 1:[11]