![]() ![]() A more accurate appraoch is to construct a box with a slit on the front and hole on top such that the smartphone can observe the illuminated sun line on the floor of the box ("Slit method"). In basic form, the app allows you to acquire the sun azimuth by pointing toward the shadow of a vertical object such as a building ("shadow method") or the shadow of a vertical pole ("gnomon method"). It is currently in beta testing and will soon be available at the Play Store. In April 2020 the ENEA team announced the developed the smartphone app i called "SunPass". Furthermore, the ENEA compass provides the orientation in a few seconds, a time extremely shorter than that necessary for gyrocompasses."īy 2018 this was tested in Antarctica and now the mathematics has been reduced to fit into your smart phone. The latter is one of the best currently available values, comparable to those achievable by means of much more expensive and sophisticated devices, like coupled GPS systems (see for example U.S. ![]() According to ENEA, the ".electronic solar compass is compact, completely automatic, cheap, and reaches an accuracy better than 1 arcmin. A smallArduino computer uses the UTC time plus geographic coordinates to compute the local sun azimuth and then compares it to the position of the sun's projection of a slit on a CMOS detector. Essentially this is an electronic solar azimuth compass. ![]() The heart of the device is a combination of GPS receiver for determining both time and geographic position and a solar collector consisting of a narrow slit and a CMOS image detector. In 2017 Sara Bollanti and her team at ENEA in Frascati developed a solar compass that "is 100 times more precise than magnetic compasses." with applications for surveying, civil engineering, and for us, sundial alignment. The National Agency for New Technologies, Energy and Sustainable Economic Development (ENEA) is an Italian Government sponsored research and development agency. ![]()
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