I am often on the road when I’m near a dark sky sight and I don’t have access to my home computer which has the software I use to see what’s in the sky. This website is fast, easy, ad-free and accurate. Everything you need from a Planisphere. If you don’t know about Ernie Wright then you should browse the site a bit. He is a NASA visualization expert that is responsible for some of the famous images that you are probably already familiar with.