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..

140.00 Ex Tax: 140.00

Detecting Extraterrestrial Gravity

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

140.00 Ex Tax: 140.00

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..

140.00 Ex Tax: 140.00

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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Centrifugal vanes makes high pressure, great outflow.High quality engine ensures safe and steady eff..
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Special artificial rubber to keep a steady air output and pressure.Advanced air-compressing system, ..
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Centrifugal vanes makes high pressure, great outflow.High quality engine ensures safe and steady eff..
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Special artificial rubber to keep a steady air output and pressure.Advanced air-compressing system, ..
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OCEAN FREE FISH FOOD 20gm Size: Mini Pellet..
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The key to superior adsorption is the maximized surface area found on each granule and pellet of a..
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Ready-to-use long-term nutrient substrate mixture for new aquariumsDoes not require mixing with grav..
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Natural substrate which filters and enhances plant growth.Supports the filter with its large coloniz..
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All natural premium planting media for aquarium plantsBenefits:    Made of 100% pure ..
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