sentences:  In 1660, he became the professor of astronomy at Gresham College in London, taking over for Sir Christopher Wren, and he was also appointed Dean of Wadham College.He became one of the earliest members of the Royal Society, and he was also made the registrar of the diocese of Chester.During the 1660s, he was active in the Royal Society, with two letters published in "Philosophical Transactions" in 1665 and 1666.