NATS 1880 Lecture Notes - Lecture 2: Murchison Promontory, Spherical Earth, Anaximander
8 Dec 2020
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Chapter 2: the science of life in the universe. Thales of grace suggested that the universe was understandable. More wight was given to intuition and thought than observation and experiences. Mathematics was developed principally by the greeks and used to help further their discussions on the construction of the universe. Early greek philosophers were prepared to discard a theory if observation proved the theory to be incorrect. The appearance of the sky from earth: the celestial sphere. An imaginary sphere of large radius, concentric with earth. All objects in the observer"s sky can be thought of as projected upon the inside surface of the celestial sphere as it were the underside of a dome. An object altitude (above horizon) and direction (along horizon) specify its location in your local sky. Horizon: all points 90 degrees away from zenith. Meridian: line passing through zenith and connecting n and s points on the horizon.
