1. Announcements Prelim I is in 2 weeks! In-section review next week Assignment: send me 2 questions or concepts you want me to review by Sunday at 7pm – Email your questions to: shoshe@astro.cornell.edu – This counts as 2 points of today’s section grade – Also, homework is due next week

2. Homework Due in section – If you’re not in section on the day that homework is due, you’ll lose 2 points for attendance All answers must be in your own words – This shows me that you understand the concepts – Do not copy from the book – Do not copy from the lectures/section notes – Do not copy from a friend

3. Any questions from the past week?

4. Concepts from the past week Sidereal vs. synodic days and periods Seasons Phases of the Moon Tides

5. Image from http://en.wikipedia.org/wiki/File:Sidereal_Time_en.PNG Sidereal vs. Synodic

6. Seasons Image from http://visual.merriam-webster.com/earth/meteorology/seasons-year.php

7. How seasons work Animated gif from http://deepimpact.umd.edu/disczone/braintwist-comet1a.html

8. Phases of the Moon

9. Tides I Image from http://commons.wikimedia.org/wiki/File:Tidal_braking.svg

10. Tides II Image from http://www.windows.ucar.edu/tour/link=/earth/Water/ocean_tides.html