Class Notes (835,587)
Canada (509,265)
Physics (324)
PHYS 183 (78)
Tracy Webb (34)
Lecture

Astronomy as a Science.docx

3 Pages
113 Views
Unlock Document

Department
Physics
Course
PHYS 183
Professor
Tracy Webb
Semester
Winter

Description
Astronomy as a Science Goals and key points: Understand the development of Astronomy as a science through an overview of the Copernican Revolution +Astronomy as a science -Ancient civilizations have always used astronomy. Ex. marking the seasons, navigation etc. -Astronomy as a science has roots in many ancient cultures. Familiar example: Greece -Measuring the circumference of the Earth in 240 BC: - Measurement: Syene to Alexandria: distance = 5000 stadia angle = 7 degrees - Calculation: 7/360 × (Earth circum.) = 5000 stadia Earth circum. = 5000 stadia × 360/7 = 250 000 stadia 1 stadia ~ 1/6 kilometers Earth circum. = 42 000 kilometers (actual value is 40 075 kilometers) +Early Astronomy -The Greeks were among the first to make mathematical models of nature. They attempted to explain patterns without the use of supernatural intervention. -The Greek model of the Universe underpinning of the model: • Earth is at the center (geocentric) • Heavens must be perfect (spheres etc) This was driven by evidence and philosophy Evidence: • The Sun, stars and planets appear to move around the Earth • No perceptible movement of the Earth Philosophy: • They insisted on mathematical perfection (whole numbers, perfect spheres, musical scales etc.). • This insistence eventually lead to stagnant models and a refusal to change in the face of new evidence. -Ptolemy’s model (150 A.D.) The complex motions of the planets are difficult to explain within the geocentric model. Retrograde motion: Planets usually appear to move E to W but occasionally reverse direction (W to E). (Chapter 2, section 2.4) Ptolemy intro
More Less

Related notes for PHYS 183

Log In


OR

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


OR

By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.


Submit