Hi Cliodhna,
The Sun resource gives plenty of scope for exploring Mathematics>Measuring.
With Junior Cycle students I ask them to make scale models of the Earth and Moon with playdoh, and then put the models at the correct scale distance apart. None of them ever get it right!
I picked up another demonstration from Armagh Planetarium -which is to wrap a bit of string around a volunteer’s head – if the Earth is their head, the Moon is about the size of their fist, but the distance to the Moon is 30 Earth diameters – or 10 circumferences. So I wrap the string 10 times — it usually comes out to be about 5 or 6 m away.
Very visual!