SciShow Kids recently published a new video that explains to students how a sundial works and how they can make their own sundials. The video could be the basis for a fun, hands-on lesson about learning to tell time.
For those in cold, northern climates creating and taking sundials outside with your students might not be practical in the snow. So SciShow Kids has a video that is a little more appropriate for winter. That video is How to Make a Paper Snowflake. The video gives directions at a nice pace that students can follow. The video also introduces some science vocabulary that might be new to elementary school students.