It’ll also depend to a degree on what time of night you’re looking. Usually, when you see a star chart for a particular month, it means shortly after sunset, since more people are awake then than midnight or the early morning. If you’re going to be up later than that, you’ll want to use a star chart that’s one month later for every two hours later you’re looking. Thus, for instance, if your star charts show 8:00 PM, and you’re outside at 10:00 PM in June, you’ll see something that looks like the 8:00 July chart.