Wang Fan (228–266), style nameYongyuan, was an official and astronomer of the state of Eastern Wu during the Three Kingdoms period. He was from Lujiang (southwest of present-day Lujiang County, Anhui). He was proficient in mathematics and astronomy. He calculated the distance from the Sun to the Earth, but his geometric model was not correct. In addition, he give the numerical value of π as 142 / 45 = 3.155… (Schepler 1950, p. 168; Volkov 1997, p. 312), not as accurate as the contemporary mathematician Liu Hui achieved.