This is in response to Serenity Tor's request at the end of a polling question. I thought I'd move the response here so it was more visible.
In 2.1 Stephane added Hemisphere support. To quote her posting on it:
"1) To set the app for Southern Hemisphere mode, go into Settings -> Wicca Plus -> North/South Hemisphere. I decided to do it this way as it’s likely something you’ll only need to do once, and it didn’t make sense to add the whole location framework for a function that’d only typically be needed one time."
In version 3.x, this has been moved to the settings function inside WP. You don't need to go to iOS settings for this.