This set of pocket notebooks cover the most popular Northern and Southern hemisphere constellations. When you look up at the night sky, it will be the time of year that will determine exactly which of those constellations you will be able to see. Some constellations can always be seen in each hemisphere throughout the year (Ursa Minor and Crux for the Northern and Southern hemisphere respectively).
Been using these for a while now always have one in my Back Pocket (I use clear film laminate on the cover they last for ever)
big fan of support small cottage businesses Justin Avery a smashing guy  click image to view/order