Celestial Mechanics


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A Plotting Device for Predicting the Orbit of an Earth Satellite

AMATEURS WHO ARE INTERESTED in predicting the positions in orbit of the earth satellites that broadc..

134.00 Ex Tax: 134.00

Detecting Extraterrestrial Gravity

Every Sunday morning I enjoy a walk along a two-mile stretch of the world's most sensitive gravimete..

134.00 Ex Tax: 134.00

Graphs That Predict When Planets Will Line Up with Another Planet or the Sun

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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Mostly about How to Study Artificial Satellites Without Complex Equipment

ARTIFICIAL SATELLITES AND THEIR associated hardware have opened new horizons for the amateur scienti..

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Mostly about Ingenious Ways of Studying Artificial Satellites

THERE IS SOMETHING ABOUT THE flight of an artificial satellite across the night sky that fires the i..

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On the Making of Recording Instruments and a Moving Model of the Solar System

HENRY MARROWS, AN INSTRUMENT DESIGNER of New York City, quarrels with the cliche that the primary to..

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Simple Ways to Calculate the Orbits of Space Vehicles

EACH TIME A MANNED SATELLITE is sent aloft the world waits anxiously to learn if it has gone into or..

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Use to measure pH changes in marine aquariums, aquariums with African cichlids, and very alkaline ..
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FRESHWATER MASTER TEST KITMeasures the most important aquarium levels quickly and accuratelyBenefits..
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GH & KH TEST KITThis test kit includes everything you need to measure the general and carbonate ..
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6-fold test strips for quick water testing50 test strips.NEW: With a chlorine test (disinfectant in ..
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