PGCC PSC 1010 - Lecture Notes (21 pages)

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Lecture Notes



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Lecture Notes

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Pages:
21
School:
Prince George’s Community College
Course:
Psc 1010 - Introduction to Astronomy

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Quiz 1 Recap PSC 1010 20110915 Scientific Method Hypothesis initial idea observation on physical phenomenon or an answer to the question how does something work Must be testable Theory widely accepted explanation for a physical phenomenon Hypothesis evolves into a theory after Rigorous testing in controlled experiments Communicating results to peers publishing More testing by independent researchers teams An accepted theory will be able to make accurate predictions about physical phenomena Motions of Sun Moon and Planets The apparent motion of the Sun Moon and planets relative to the background stars through the Zodiacal constellations as measured from night to night is a consequence of the facts that The Moon orbits the Earth and The Earth and planets orbit the Sun and These orbits lie in approximately the same plane in space within the band of the Zodiac Our line of sight to any of the planets Sun and Moon changes relative to the background stars and constellations as the Earth Moon and planets orbit the Sun Since all orbits are in approximately the same plane the Sun Moon and planets all cross in front of the same group of constellations all on the ecliptic plane the Zodiac The Zodiacal Constellations The path in the sky that the Sun Moon and planets follow throughout the year and year after year is called the ecliptic The constellations that the ecliptic passes through are called the Zodiacal Constellations As with constellations anywhere in the sky only those Zodiacal constellations in a direction away from the sun are visible at any given time of year in the night sky The Zodiacal Constellations The Zodiac constellations are those constellations that the Sun Moon and planets pass through during the course of a year and repeating year after year yellow dots on figure indicate the ecliptic path If the Earth s axis was not tilted Every day would be an equinox For any single spot on the Earth sunlight angle of incidence would not change from day to day There would



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