1 Subjects: “...Observations, Astronomical...”

2 “... geometric exposition by Euclid. Ptolemy, an early astronomer, began to go beyond Euclid, using the geometry...”

3 Table of Contents: “... Century Spain -- Chapter 19. Sino-Indian Interaction and the Great Chinese Buddhist Astronomer...”

4 “... to astronomers who use triangulation to measure the distance between stars. Trig also has applications in fields...”

5 “... astronomers developed the first true trigonometry. He traces the slow emergence of modern, analytical...”

6 “.... GolchTn­ Ma'anT also sent me, most generously, a copy of his catalogue of the astronomical...”

7 “..., the astronomical system of units, and walkability distance. Leaving aside the practical questions that arise during...”