Hoshizora Navi (Star Sky Navigator) is software to view and chart stars on your DS. You can adjust what year you are viewing from and also from many points on the globe. Look to be honest I don't give a hoot about this piece of software. What has interested me is the technology that has gone into the cartridge. You can put up your current time and date and location and the picture displayed on the DS is what you should be seeing on a clear night. That's not the good bit. The good bit is that if you rotate your body around, the display on the DS moves with you to match what you should be looking at in the night sky. This may all be done with a simple electronic compass but it is still cool in my books. Google translate of the official site: translate.google.com.au/
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http://www.destructoid.com/ds-gets-direction-sensing-for-star-gazing-title-118986.phtml