Bharatiya Jyotihshastra (History of Indian Astronomy), translated by R. V. Vaidya v2.c12.s2.t7.39

v2.c12.s2.t7.39

“Whatever is obtained after dividing the planet’s orbital length by the moon’s orbital length, is to be known as the planet’s mean distance in lunar-minutes of arc. When this number is multiplied by 15, it gives the semi-diameter of the planet’s orbit, which represents the planet’s geocentric distance. This can otherwise be calculated from the geocentric radius of the orbit of the heavens (i.e. that of the celestial sphere).”