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AMATEURS WHO ARE INTERESTED in predicting the positions in orbit of the earth satellites that broadc..
144.00 Ex Tax: 144.00
Every Sunday morning I enjoy a walk along a two-mile stretch of the world's most sensitive gravimete..
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FROM TIME to time a planet, as it is observed from the earth, moves into alignment with the sun or w..
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ARTIFICIAL SATELLITES AND THEIR associated hardware have opened new horizons for the amateur scienti..
144.00 Ex Tax: 144.00
THERE IS SOMETHING ABOUT THE flight of an artificial satellite across the night sky that fires the i..
144.00 Ex Tax: 144.00
HENRY MARROWS, AN INSTRUMENT DESIGNER of New York City, quarrels with the cliche that the primary to..
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EACH TIME A MANNED SATELLITE is sent aloft the world waits anxiously to learn if it has gone into or..
144.00 Ex Tax: 144.00
