A: In general, pearls symbolize innocence, love, perfection and purity. Gold and black pearls are symbolic of wealth and prosperity. Fresh water pearls are thought to help open the heart to receiving love and to encourage self-love. White pearls are symbolic of faith, a pure heart, innocence and a pure mind.
He measured the angular separation of the Sun and the Moon when its phase was first or third quarter to derive the distance between Earth and Sun in terms of the distance between the Earth and the Moon. Eratosthenes (276-194 BC) also measured the distance between Earth and Sun as 804,000,000 stadia.
Performed a remarkably accurate computation of the earth's circumference by measuring the sun's angle at the summer solstice and the distance between the two Egyptian cities of Alexandria and Syene. He is also credited with coining the term geography..