English Language · Para Jumbles

Sentences of a paragraph are given below. While the first and the last sentences (S1 and S6) are in the correct order, the sentences in between (P, Q, R, S) are jumbled up. Arrange the sentences in the correct order to form a meaningful and coherent paragraph. S1. Hipparchus is a Greek astronomer. P. Thus, he has the credit of being the founder of the trigonometry branch in mathematics. Q. He was born in Nicaea and did most of his work at the Rhodes observatory. R. He also compiled a table of chord lengths similar to modern trigonometry tables. S. He recorded the accurate position of about 850 stars and categorised them on their brightness level. S6. He used the term 'first magnitude', which is still used by astronomers.