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Saturn lecture
Saturn lecture

... Pressure and temperature conditions were such that methane, ammonia and water were stable in solid form As you move out from the sun, each planet has less hydrogen and helium and more ice ...
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Astronomy Activities/Demonstrations

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... The first step in reading a horoscope is to familiarize oneself with the intrinsic nature of the signs, houses, planets, and the aspects. This will form the subject of the present and several future articles. The student is urged to thoroughly memorize our different classifications, for when reading ...
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Orrery



An orrery is a mechanical model of the solar system that illustrates or predicts the relative positions and motions of the planets and moons, usually according to the heliocentric model. It may also represent the relative sizes of these bodies; but since accurate scaling is often not practical due to the actual large ratio differences, a subdued approximation may be used instead. Though the Greeks had working planetaria, the first orrery that was a planetarium of the modern era was produced in 1704, and one was presented to Charles Boyle, 4th Earl of Orrery — whence came the name. They are typically driven by a clockwork mechanism with a globe representing the Sun at the centre, and with a planet at the end of each of the arms.
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