Moon Locator predicts the moon position, path and phase at a specific location during the course of a day and year. ★ The Main View displays all the detailed information ★ The Augmented Reality (AR) feature displays the lunar position directly overlaid on your device's camera. ★ The Map feature displays the moon position on top of Google Maps
@rrhoover it's based on your device's compass and motion sensor, so the app knows which direction (altitude and azimuth) the device is pointed at and knows the location of the device from the GPS (longitude and latitude). So the moon location is calculated and displayed on top of the camera layer. The problem is that the accuracy of the app completely depends on the accuracy of your device's compass, so if there's any magnetic interference, the predicted moon location in the AR view is also off. But it seems to work quite well in practice, if the compass is calibrated regularly.
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