Here's a worksheet aimed at older children, all about the Earth's orbit. Can they find out the information needed to answer the questions, then draw a picture of the Earth's orbit and label the equinoxes and solstices?
Are you learning about the different seasons at the moment? If so, ask the kids to try and complete this Spring Equinox Worksheet, which has questions all about the Spring Equinox, and space to draw and label a picture too.