What: Drawing around our shadows to see the way the sun moves – and how silly it looks when our shadows stretch or shrink!
How: You need a space long enough to do the shadows, that gets some direct sun. Our driveway is our preferred spot. Also, chalk. Then, it’s just a matter of when you do it. This week’s drawing was in honour of the winter solstice, done not long after dawn, so the shadows are at their longest for the year. On other occasions we’ve repeated the activity at noon or in the afternoon, so that you can see how the shadows point the same direction at a given time (they’re parallel) but point the other way later, or how they are much shorter at noon than they are early or late.
Extras: There’s so much to play with here, in the themes of astronomy, seasons, time and change. Winter and summer shadows are quite different in direction and size. If you do this activity every couple of months the kids may remember what it was like the last time (mine didn’t!) – or take photos to assist the comparison. You could stand on one spot and repeat the outline every hour or two to overlay a series of shadows for that day (older kids could talk more specifically about angles or measure lengths). There’s plenty to talk about how the sun moves, how it’s lower in the sky or higher with the seasons, how dawn is late in winter but very early in summer (if you’re getting up to do a dawn drawing!). My preference is to not talk much about it, but to try and do the exercise often enough that the kids themselves realise that something is changing and start the conversation themselves. Though more often they’ve gotten distracted by the presence of chalk and begun colouring in their own pictures and adding details – and that’s just fine too. At some point I will probably use this activity as a foundation exercise before we play with sundials – both the normal fixed kind and the kind where you use yourself as the gnomon. I’d love to build one of these in the garden with stepping stones! And of course there’s the survival skill of using the movement of shadows to find north, which is easier understood if you’ve spent time thinking about the idea that your shadow isn’t fixed or constant.