I think the moon is something children are always interested in as it’s something that they can constantly see changing so I would teach about the phases of it.
i’d start with a suitable book or perhaps ‘Hey Diddle Diddle’ (The Cow jumped over the moon reference)and discuss what they already know about the moon. i’d ask the students to observe the moon over time and take photos to post on Dojo to document changes that they see.
At the end of the month, displaying all the pictures offers a wonderful opportunity to discuss how the moon changes each week and to introduce the names of each phase, with the possibility of adding extra phases if the students are particularly curious.