... 3a. Angle . of sunlight . ... The Moon (1) . ... 4b. Moon Libration . ... The apparent path of the Sun across the sky. Note how much higher the Sun is in the sky in mid-summer! ... In addition, they are invariably tilted at an angle around 45 , to make sure that the arrival of the sun's rays is as close to perpendicular as possible. ... The rays of the summer sun, high in the sky, arrive at a steep angle and heat the land much more than those of the winter sun, which hit at a shallow angle. ...
... In the late 70s, high speed (several hundreds km/s) plasma flow events were found in the plasma sheet boundary layer, PSBL (e.g., Lui et al., ... Angelopoulos, V., Baumjohann, W., C. F. Kennel, F. V. Coroniti, M. G. Kivelson, R. Pellat, R. J. Walker, H. L hr, and G. Paschmann, Bursty bulk flows in the inner central plasma sheet, J. Geophys. Res. ... Baumjohann, W., G. Paschmann, and H. L hr, Characteristics of high-speed ion flows in the plasma sheet, J. Geophys. ... Lui et al, J. Geophys. ...
... NASA Lunar Orbiter . ... The Lunar Prospector is designed for a low-polar orbit investigation of the Moon, including mapping of surface composition and possible polar ice deposits, measurements of magnetic and gravity fields, and study of lunar outgassing events. Data from the 1- to 3-year mission will allow construction of a detailed map of the surface composition of the Moon, and will improve our understanding of the origin, evolution, current state, and resources of the Moon. ...