I provided a link earlier for Heavens Above.
This is the best service by far, you can get a free app for your phone as well which will show you where in the night sky to look in realtime, just hold your phone up in the air.
It also shows all satellites and space debris.
This page shows all passes for Dublin in the next 24 hours, if you click on the time you will see the sky map, if you download the app it will show you in the sky in realtime.
You can change you location tom anywhere.