Astronomy 2022A/B Lecture Notes - Lecture 1: Aswan, Deferent And Epicycle, Celestial Spheres

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Lecture 1 - early thoughts of the universe. Notation: the symbol ~ means very roughly equal to : for example: 24+32 ~ 10^2. Earth-centre of our milky way galaxy: 200,000t km. All space, matter and energy that is accessible to us. Cosmology - study of the universe (or cosmos) as a whole. For the most part we will use cosmology to encompass all of these phases. A flat earth was a common assumption among most early cultures. Below is schematic diagram of egyptian cosmology; very similar to mesopotamian and the hebrew: the earth is separated from the sky by air. The greeks were the first to introduce the (correct) idea of a spherical earth: aristotle most famous. Eratosthenes (c. 240 bc) actually measured the earth"s diameter to within 2% with no modern tools: heard that at noon on the longest day of the year, shadows of columns disappeared in syene, egypt, indicating that the.

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