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the strange case of claudius ptolemy
the strange case of claudius ptolemy

... 1 R . R . Newton, Applied Ancient Astronomy, " ...
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... such as this? So far there is no indication that they do,...some astronomers have suggested the only way out is to modify Newton's law of gravity." from page 9 & 74-5 of "Invisible Matter and the Fate of the Universe" by Barry Parker. Mystery force tugs distant probes, By BBC News Online science edi ...
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... Measuring the angular position of a star in the east-west direction is meaningless unless you know what time it is. If you sail from London westward, you want to know how far in longitude you have traveled. But that requires knowing what time it is back in London. If you measure the angular positio ...
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Lunar theory

Lunar theory attempts to account for the motions of the Moon. There are many irregularities (or perturbations) in the Moon's motion, and many attempts have been made to account for them. After centuries of being problematic, lunar motion is now modeled to a very high degree of accuracy (see section Modern developments).Lunar theory includes: the background of general theory; including mathematical techniques used to analyze the Moon's motion and to generate formulae and algorithms for predicting its movements; and also quantitative formulae, algorithms, and geometrical diagrams that may be used to compute the Moon's position for a given time; often by the help of tables based on the algorithms.Lunar theory has a history of over 2000 years of investigation. Its more modern developments have been used over the last three centuries for fundamental scientific and technological purposes, and are still being used in that way.
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