To go with our astronomy lesson on stars and galaxies we made this astrometer. It’s a piece of cardboard (we used a cereal box) with four rectangles cut out of it. Then we layered saran wrap over each section. The top section has four layers, the next has three, then two, then one. The idea is to look at stars through the different sections to see how bright the star is. If you can see it through one layer, but not four, then it is not as bright as a star you can see through four layers. A low-tech option for rating the brightness of stars.
It didn’t work all that well for us, I think the wrinkles in the saran wrap made it more challenging to judge if you were actually seeing the star’s brightness or just wrinkles. We had fun outside anyway, playing with the Night Sky app and finding things in the sky. We were excited to find the constellation Orion, Jupiter, and others.