Three Earth Orbit Timers (15 minutes, 10 minutes, and 5 minutes) which have no sound except a bell at the end can be found on slides 2-3-4. Just press play of the video to begin each timer!The video and timer show the earth’s constant 23.5 degrees tilt, showing how we get seasons throughout the year by shining more or less light on the northern or southern hemisphere as the earth orbits the sun.Each orbit is 1 minute of the timer, minutes remaining shows in the upper left hand corner, seconds mo