"Starry Night" or 'Celestia' and many other astronomy programs allow you to pan forward in time to find optical alignments. You are going to need some time to look as it may not be as simple as you hope. Remembering that an alignment has never been recorded of all the planets. It might not ever actually happen. To get seven planets all aligned would be amazing. All nine could not be seen as Venus and Mercury would be daylight objects. The Elf told me...