Textbook Notes (363,566)
Canada (158,433)
Astronomy (53)
AS101 (52)
Chapter 3

Chapter 3 Textbook Definitions

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Wilfrid Laurier University
Shohini Ghose

Chapter 3: The Origin of Modern Astronomy First Principle – something that seems obviously true and needs no further examination Geocentric Universe – a model of the universe with Earth at the centre Uniform Circular Motion – combinations of circles turning at uniform rates Parallax – the apparent motion of an object because of the motion of the observer Heliocentric Universe – a model of the universe with the Sun at the centre Paradigm – a commonly accepted set of scientific ideas and assumptions Ellipse – a closed curve around two points, called the foci, such that the total distance from one focus to the curve and back to the other focus remains constant Semi-Major Axis – half of the longest diameter of an ellipse Eccentricity – a number between 1 and 0 that describes the shape of an ellipse (how elongated it is) - the distance from one focus the centre of the ellipse divided by the semi-major axis Empirical – description of a phenomenon based only on observations without explaining why it occurs Hypothesis – a conjecture, subject to further tests, that accounts for a set of facts Theory – a
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