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.
Great minds had tried for centuries to develop a method of determining longitude. Hipparchus, a Greek astronomer (190â120 BC), was the first to specify location using latitude and longitude as co-ordinates. He proposed a zero meridian passing through Rhodes. He further suggested that absolute time be determined by observing lunar eclipses, measuring the time when a lunar eclipse started and finished, and finding the difference between this absolute time and local time.