ASTR 1P01 Chapter Notes - Chapter 2: Gravitational Constant, Centripetal Force, Net Force

• School: Brock University
• Department: Astronomy
• Course: ASTR 1P01
• Professor: Bozidar Mitrovic

Document Summary

Different cultures from that period might have used the monuments to keep track of the seasons (a matter of life and death!) Classical period (from 500 bc to 1400 ad: we focus on the astronomy of greece (influenced by astronomy of babylonia and egypt, the chinese, indian and islamic astronomers also made important contributions. Some notable greek thinkers and astronomers: thales of miletus (624-546 bc): human mind can understand why the. The distance to the sun must be much greater than the distance to the. But these two intervals of time are nearly the same (about 2 weeks). For these two intervals to be almost equal the earth-sun distance must be much greater than the earth-moon distance. He measured the angle a and determined the ratio: (see diagram 2. 5) He measured a= 87 degrees (the actual value of a is 89 degrees and 59.