AST MIDTERM2 - INTRODUCTION TO ASTRONOMY-Right Ascension(RA...

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Sheet1 Page 1 INTRODUCTION TO ASTRONOMY -------------------------------------- Right Ascension (RA) and Declination (DEC): like longitude and latitude when mapping out the sky (represented by a celestia l Celestial equator: the line you obtain when you project Earth's equator onto the celestial sphere Ecliptic: the sun's path on the sphere (the zodiac lies on the ecliptic) Asteroid belt lies between Mars and Jupiter Kuiper belt lies beyond Pluto Oort cloud (collection of objects MOTION --------- The apparent size of the moon is the same as the Sun Moon in front of Sun = solar eclipse Earth in between moon and sun = lunar eclipse FORCE -------- Kepler's three laws (from observations) are: 1) planets orbit on ellipses rather than perfect circles 2) equal areas in equal time 3) P2 = a3 Newton's three laws: 1) An object moves at a constant velocity if no net force acts on it 2) Force = mass x acceleration 3) For any force there is an equal and opposite reaction force Spring tide: Sun and moon are on the same line - larger than normal tide
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AST MIDTERM2 - INTRODUCTION TO ASTRONOMY-Right Ascension(RA...

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