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Announcements. Exam 1 is one week from Friday. It covers Chapters 1, 2, 3 & 4. Sample Questions are posted on APSU Astronomy website. The exam will be from in-class lecture-tutorials , SmartWork homework, sample questions and class lectures. If you have questions, ASK!!!

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- Announcements Exam 1 is one week from Friday. It covers Chapters 1, 2, 3 & 4. Sample Questions are posted on APSU Astronomy website. The exam will be from in-classlecture-tutorials, SmartWork homework, sample questions and class lectures. If you have questions, ASK!!! Bonus Points for Exam 1: Go to a planetarium show…+5 (+3 for a second show) Wear an Hawaiian shirt to the exam…+3 Go to BSAS star party at Long Hunter State park this Saturday starting at 8:00pm…+5
- 1st Quarter Observing Night this Thursday night Location: if clear…Archwood parking lot if rainy…SSC Atrium Start time: 8:30pm. Cloudy, clear or rainy What to bring: a notebook or something to record presentation with Presentation materials: in the 1st Quarter Observing Nights link in the Observing Nights link on APSU Astronomy This is the first of three 1st Quarter nights this semester
- Kepler’s 1st Law The Law of Ellipses The planets move in elliptical orbits with the Sun located at one focus This was a radical departure from everyone who had come before, even Copernicus
- Kepler’s 2nd Law Law of Areas A line drawn from a planet to the Sun will sweep out equal areas in equal time periods
- Colored Card Question ClassAction website Renaissance Astronomy module Kepler’s 2nd Law
- Kepler’s 3rd Law The Law of Harmonies The ratio of the square of the orbital period to the cube of the semimajor axis (the orbital radius) is the same for all the planets
- Colored Card Question ClassAction website Renaissance Astronomy module Table: Kepler’s 3rd Law
- ClassAction Planetary Orbit Simulator Play with the Planetary Orbit Simulator on the ClassAction website Renaissance Astronomy module to illustrate Kepler’s Laws
- Why study Kepler’s Laws? Isn’t this Stellar Astronomy? Look at the Eclipsing Binary Simulator on the ClassAction website Binary and Variable Star module
- Kepler’s Three Laws of Planetary (and stellar) Motion 1st Law: The planets move in elliptical orbits with the Sun at one focus. 2nd Law: A line drawn from a planet to the Sun sweeps out equal areas in equal times 3rd Law: The ratio of the square of the orbital period to the cube of the semimajor axis is the same for all planets
- Kepler’s Law’s Worksheet Do Kepler’s Second Law worksheet starting on page 21 of Lecture Tutorials for Introductory Astronomy Work in groups of 2 or 3 You have 20 minutes

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