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Lecture 1

PHYS 170 Lecture 1: Astronomy week 1

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PHYS - Physics
Course Code
PHYS 170

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Chapter Zero Universe: Totality of all space, time, matter and energy. Scales are very large, measured in lightyears, the distance light travels in a year is about 10 trillion miles Without liquid water there can be no chemical reactions which could create life Stars that appear close together in the sky does not mean that they are close together in space Latitude: Used to locate things on earth, 0 degrees is located on the equator Declination: used to locate things in space, horizontal, celestial analog of latitude Longitude: used to locate things on earth, 0 degrees is located in Greenwich, England Right Ascension: used to locate things in space, vertical, celestial analog of longitude Solar Day: 24 hour period Zodiac: arrangement of stars in the sky Reason for the seasons: Tilt and amount of direct sunlight Procession: Earths axis changing over the course of
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