Make an accurate diagram of the solar system and explore the concept of a grand conjunction.
Five Circuits, Seven Spins
Age 16 to 18 Challenge Level
To find the dimensions of the tray you need to work out the
angle through which the plate turns in one circuit and from that
the length of its circumference that comes into contact with the
edge of the tray as the plate rolls round.
You will need to use algebra to label the lengths of the side of
the tray.