This lesson is designed at three different levels. Each is mainly after the students being able to determine the speed of the Earth around the Sun.
Basic Version The Basic version gets to the point in the most direct way, still asking the students to search for some info on the Internet.
Advanced Version The Advanced version is asking the students to think a little bit more before searching for information in the Internet. The outcome is the same.
Physics Version Students already exposed to the Universal Law of Gravity and Circular Motion will be able to do this activity.
https://www.youtube.com/watch?v=uZ9iNsjyw7k&feature=youtu.be
This video discusses common difficulties experienced during this activity in the past.