h2g2 The Hitchhiker's Guide to the Galaxy: Earth Edition

If you want to try this, nip along to your local library and see if there are any older books on photography. Or try a secondhand bookshop. In some of these older books you'll find tables of exposure times for particular subjects that you can use as a starting point.

If you use an exposure meter (do such things still exist?) you'll need to take into account something called reciprocity failure that causes the film to need more exposure than you'd expect as the light gets dimmer (in other words, beyond a certain point, half the light means more than twice the exposure). Those old books often take this into account in their exposure tables.

I did quite a few night photos a few years ago using black and white film and I thought the results were quite good fun.