solar eclipse/lunar eclipse; rotation/revolution

lunar eclipse:  http://www.youtube.com/watch?v=wuhNZejHeBg
solar eclipse:  http://www.youtube.com/watch?v=E1B3RLf1A1s&feature=related
rotation/revolution:  http://www.brightstorm.com/science/physics/circular-motion-and-rotational-mechanics/rotation-and-revolution/
spring tide/neap tide:  http://www.youtube.com/watch?v=E8PPg5t4YyY