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precession of the equinoxes |
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precession of the equinoxes n
(Astronomy) the slightly earlier occurrence of the equinoxes each year due to the slow continuous westward shift of the equinoctial points along the ecliptic by 50 seconds of arc per year. It is caused by the precession of the earth's axis around the ecliptic pole, with a period of 25 800 years ThesaurusLegend: Synonyms Related Words Antonyms
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Annual variation astronomy earth ecliptic coordinate system equinox great year Hipparchus Lunisolar precession nutation Planetary precession Platonic year precession Precessional Tropic year zodiac zodiacal | These cycles are attributed to perturbations of the sun's orbit by the moon that cause the precession of the equinoxes and by other small effects due to the planets and are confirmed by world-wide measurements of glaciers, coral reefs, peat bogs, and polar ice caps. Evidently hoping to prove astrologers are know-nothings, Dawkins' interview started with a lengthy grilling about astronomy - the precession of the equinoxes, sidereal and tropical zodiacs, Kuiper Belt objects. Astrology begins to recede from the center of intellectual life by the late seventeenth century, perhaps not only because of the accumulation of scientific evidence, which had already begun (as Hubner reminds us) with the ancient astronomers' observation of the precession of the equinoxes, but more particularly because of the emergence of a scientific method whereby astrological hypotheses could no longer appear to constitute true knowledge. |
precession of the equinoxes |
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