| Both samples consist of fine-grained calcite with elongated or equant shapes. |
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| A few outstanding composite specimens were recovered, with crude dendritic copper intergrown with one or two large, single, equant crystals. |
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| But Ptolemy was not trying, when he devised the equant, to offer a mechanical account of why the planets moved as they did. |
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| Only a handful of high-quality azurite in equant blocky crystals to 4 cm have been found in these pockets so far. |
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| Superb, equant tetragonal crystals occur on quartz in the junction pockets. |
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| Here, is the Sun, the planet, the geometric center of the orbit, the equant, and the line of apsides. |
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| Although the Ptolemaic system successfully accounted for planetary motion, Ptolemy's equant point was controversial. |
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| Only from the equant, an imaginary point at distance 2e from Earth, would the planet appear to move uniformly. |
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| The centre of the deferent was located midway between the equant and the Earth, as can be seen in the figure. |
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| Microsparite and sparite calcite crystals are mostly equant to elongated rhombohedrons or scalenohedrons, but also a few prismatic crystals were observed. |
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| The objection to the Ptolemaic mechanism for the longitudinal motion of the superior planets was that the effect of the equant point was not obtained by uniform circularity. |
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