Star Finders (like Edmund Scientific's Star and Planet Locator) attempt to show us the sky at all times for locations "near" a given latitude (for our star finder: 40°). Since the stars rise and set (changing what's in our sky), such star finders must be adjustable for time. (Moving to a different location on the globe also changes your sky. The star finder can't adjust for this: you must buy a new finder suitable to your new latitude.)