Abstract
In this Academy Transactions Note we study the Quiet Cone that extends into space above the Farside of the Moon. This conical region of space is not polluted by man-made radio frequency interference (RFI) because the spherical body of the Moon acts as a shield against RFI coming from both the Earth and the telecommunication satellites put into orbit around the Earth. We give the geometrical dimensions of this cone as a function of the radius R EarthSat of the circular orbit of a telecommunication satellite orbiting the Earth. Clearly, the most important value of R EarthSat is the geostationary orbit radius, while the largest possible value of R EarthSat is the distance between the centre of the Earth and the Lagrangian Point L1 of the Earth–Moon system. An equation is also derived expressing how much time inside the Quiet Cone will a probe spend was it put into a circular orbit around the Moon in a plane along the Earth–Moon axis where the Quiet Cone is largest.
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