A planisphere is a special instrument in the form of two adjustable disks that rotate on a common pivot. It can be adjusted to display the visible stars for any time and date and is a great tool to help you learn how to recognize the stars and constellations of the night sky.
Have a go at making your own with our print-and-cut guide:
Click here to download in full colour
Click here for a black and white version (great for home printers!)