# Astronomy 4

 Equation for Newton's Law of Gravity Fsubg= G(Msuba)(Msub'b')/d^2 Kepler's Laws 1. The orbit of each planet and the Sun is an ellipse with the sun at one focus 2. As a planet moves around its orbit, it sweeps out equal in equal times3. More distant planets orbit the at slower average speeds, obeying the relationship Drake equation Np × f life × f civilization × fnow Scientific method SimplicityFalsifiable7Natural world Angles of the celestial sphere Altitude of NCP = your latitudeZenith is 90 degress from horizonNCP is 90 degrees from Celestial Equator Zenith is 90 degress from horizonPoint directly overhead Kepler's Third law equation p^2 = a^3 Newton's second law equation F=ma Newton's Law of Gravity Fsubg = G(Msub1)(Msub2)/d^2 Wavelength of light equation lambda x f = c Energy of light E= h x f Surface-area-to-Volume ratio 3/radius of planet The celestial sphere Includes The sun, moon, and stars appear to be on a transparent globe around the Earth Sky changes due to time time of the year and position the sun is in can change the stars seen Sky changes due to location Different latitudes see different stars differently Moon Phases We see moo n phases because we observe some combination of the day and night sides of the moon Hallmarks of Science 1. Rely on natural causes2. Simplicity - Occam's Razor3. Testable - Falsifiability Copernican revolution Copernicus- Sun centered model of the solar system Tycho - accurate observations to test the model Kepler - modified model to account for Tcho's observations Kepler's Laws of Planetary motion Newton's Laws of Motion Newton's Law of Gravity Tides? Summer solstice Summer solstice - Sun 23.5 degrees above celestial equator (more hours of daylight) Winter Solstice Sun 23.5 degrees below celestial equator (fewer hours of daylight Spring and Autumn equinoxes Sun on Celestial equator AuthorAnonymous ID250269 Card SetAstronomy 4 Descriptionfirst test Updated2013-12-03T17:51:28Z Show Answers