I normally used this as an engagement or introductory piece, but students had to draw their own images. I am so excited about using a digital notebook, and with this activity students can manipulate the sizes of the sun, earth, and moon. This activity allows you to see what the students are thinking, but could also be used as a formative assessment. I have only used it as an engagement activity to access prior knowledge.

This is a sample from the apparent motion unit ( I am still creating it).