NASA's Photovoltaic Energy Research Plans and Programs

National Aeronautics and Space Administration Motivation Lunar polar locations are of high interest for many NASA missions due to potential for ice and materials in permanently shadowed craters W Moon's rotation is slow, approximately 1 rotation every 29.5 Earth days Moon's equatorial plane is tilted by only 1.5° Locations exist that can have long durations of illumination with minimum shadowing (down to <100 hours) at high elevations www.nasa.gov S At exactly the South Pole, -90° S latitude Mid Summer (+1.5 deg above horizon) (-1.5 deg below horizon) E Mid Winter W N 옷 ヨ -90° - X° NASA In general, at -X° S latitude, Sun paths tilt up by 90° - X° For example, at -88° S latitude, Sun paths tilt up by 2°

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