Astronomy notes 1.doc

3 Pages

Course Code
AST 118
Elizabeth Bozyan

This preview shows page 1. Sign up to view the full 3 pages of the document.
Chapter 1 The scientific method: • Observation • Experimentation • Logic • Skepticism Model first seems to explain hypothesis • After testing if it correctly explains observations and predicts future observations, it is a theory • Model must always agree with the hypothesis In astronomy: • Start with observations • Then turn them into a theory The night sky and celestial sphere, chapter 1.5, 2.4 Astronomy; the study of the universe • Oldest of all the sciences Day → one earth rotation Month → one orbit of moon around the Earth Year → one orbit of the Earth around the sun In ancient cultures, astronomy was thought to influence peoples lives Modern astronomy is a pure science • Laws of physics as we know them are valid throughout the universe • Astronomy has no experimentation, only observation How many stars can we see on a clear night with no moons and no street lights? • Full sphere: 6,000 • Hemisphere: 3,000 • Extinction near horizon: 2,000 IAU= InternationalAstronomical Union Stars are not all the same distance from us Milky Way: band of light across the sky • Why? ◦ The shape of our galaxy and where we are located. It is a spiral galaxy. How do we find objects? • Everything is placed on a celestial sphere, Earth is in the center Right ascension: longitude Declination: latitude Zenith: directly over head Meridian: great circle goes through zenith and north celestial pole (
More Less
Unlock Document

Only page 1 are available for preview. Some parts have been intentionally blurred.

Unlock Document
You're Reading a Preview

Unlock to view full version

Unlock Document

Log In


Join OneClass

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

Sign up

Join to view


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.