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.
In the early 1600s, Galileo showed that the Moon had a landscape similar to that of Earth. It was rugged, with mountains and plains. This was the first hint that the Earth and Moon somehow formed together. Fast forward to the 1800s, and Charles Darwin's son George had an idea.