He considered the Euler angles and studied rotational problems which were motivated by the problem of the precession of the equinoxes. |
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The equinoctial colure is a great circle which passes through the celestial poles and the ecliptic at the two equinoxes. |
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At this stage we might as well mention two other very important dates in the year, the equinoxes. |
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As a result, the actual occurrence of the equinoxes and solstices slowly moved away from their calendar dates. |
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He explained eclipses, solstices and equinoxes, announced the sphericity of the earth and its diurnal revolution on its axis. |
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Because of the precession of the equinoxes, the equinox and solstice points have each moved westward about 30 degrees in the last 2,000 years. |
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It also has links to detailed information explaining sunrise, sunset, the solstices and equinoxes. |
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These nine nights occur on equinoxes or equal nights when the sun is vertically overhead at the equator or centre. |
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Because of the precession of the equinoxes the tropical year is shorter by about 21 minutes than the sidereal year. |
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During the spring and fall equinoxes, the Sun also passes through this plane. |
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The lengths of the hours were equal around the equinoxes but the rest of the time they could vary considerably. |
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In ancient times, fasts were traditional at the vernal and autumnal equinoxes and were believed to increase fertility. |
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These points are called the equinoxes, and on the days of the equinoxes the hours of daylight and night are equal. |
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He was not the first Chinese astronomer to discover the precession of the equinoxes but he was the first to take this into account in calendar calculations. |
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About fifty years after Liu's remarkable contributions, a major advance was made in astronomy when Yu Xi discovered the precession of the equinoxes. |
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The gravitational pull of the sun and moon cause a phenomenon known as the precession of the equinoxes, which makes the earth's axis move in a cone shape. |
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Note that day length is at a minimum at the start of winter, at a maximum at the start of summer, and is 12 hours at the spring and fall equinoxes. |
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The term is still used, though precession of the equinoxes has moved the vernal equinox into Pisces. |
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Cassiopeia went through over 100 quarterly issues, named for the solstices and equinoxes, until it was replaced by an electronic version. |
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In addition to the solstices, which officially mark the first days of summer and winter, there are also two equinoxes. |
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They take place at certain times of year like the summer and winner solstices, and at the equinoxes. |
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The equinoxes and the solstices happen only on the Cardinal Cross whose significance is known completely only by the adepts of wisdom. |
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The line of intersection of these two planes marks the equinoxes, the points at which the Sun apparently crosses the Equator as it passes from one hemisphere to the other. |
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The rapidly changing length of day around the equinoxes might disturb the circadian and sleep-wake rhythms and change mood and activity in vulnerable individuals. |
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Long-term changes in the dates of the solstices and equinoxes are caused mainly by tugs imposed on the orientation of the Earth's spin axis by the Moon. |
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The vernal and autumnal equinoxes occur when the ecliptic crosses the celestial equator, so linking stars, sun and earth through the passage of time. |
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Some deduced, with good reason, that the Sun was to lie down in the axis of the Grand canal at the equinoxes. |
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AnĀ exercise with the Earth to be made the days of solstices and equinoxes. |
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On the spring and summer equinoxes the Sun lies 90 degrees from the Pole, and about 40 degrees below the horizon at midnight. |
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At the equinoxes it is halfway: going Northward in the spring and Southward in the autumn. |
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So, if the full moon falls within the 13 days between the Gregorian and Julian equinoxes, Orthodox Easter will be later. |
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In 2007 archaeological research emerged suggesting that Chankillo had been a solar observatory capable of tracking the solstices and the equinoxes, the oldest of its kind in the Americas. |
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When this is added to the discrepancy between the Julian and Gregorian equinoxes, it can lead to a difference of up to five weeks between the Orthodox and Western dates for Easter. |
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Popular times are pagan festivals, such as Hallowe'en, Beltane, the summer and winter solstices and the autumn and spring equinoxes. |
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The largest bores occur around the times of the equinoxes but smaller ones can be seen throughout the year. |
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Inca astronomers understood equinoxes, solstices and zenith passages, along with the Venus cycle. |
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They consisted of three small structures facing a fourth structure, and were used to mark the solstices and equinoxes. |
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From the west pyramid, the sun was seen to rise over these temples on the solstices and equinoxes. |
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The most accepted theory about the meaning of the alignments is that the lines of menhirs are orientated in order to face the sunrises during the solstices and equinoxes. |
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Instead, the prize is now awarded every 18 months, at the autumn and spring equinoxes, to a single winner who is active in one of these particular fields. |
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This is in no way a manifestation of crypto-sexism but a simple consequence of the direction of the precession of the equinoxes. |
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Precession of the equinoxes, or wobbles on Earth's spin axis, complete every 26,000 years. |
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These are the solstices, Sun, the effects of rotation, revolution, and approximately midway between the orientation of the Earth's axis on the path of equinoxes. |
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Calendrically, it was an important discovery because the tropical year is measured with reference to the equinoxes, and precession reduced the value accepted by Callippus. |
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During the equinoxes of March and September, the sun passes across the plane of the equator, which means that it is on the same plane as the geostationary orbit. |
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On the strip crossing the floor the indication points identify where the spot of sunlight would fall on the strip on the equinoxes and various religious festivals that occur at fixed dates. |
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It is not by chance that the Ancient One's practised their rituals and their festivals at precise times such as sun rise and sun set, the solstices and equinoxes. |
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In addition, since the Sun moves North and South rather like the movement of a swing, it moves slowly around the solstices and very quickly around the equinoxes. |
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The ends of the analemma represent summer and winter, but if we expect the solstices to be exactly at the ends and the equinoxes to be at the crossing point, we'd be wrong. |
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However, the precession of the equinoxes gradually lowered the stars below the European horizon, and they were eventually forgotten by the inhabitants of northern latitudes. |
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The ad claims the nuraghi were ancient temple-observatories whose purpose was to indicate the solstices and equinoxes by lining up with the rising sun and moon on those dates. |
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Satanic holidays include Walpurgisnacht and Halloween, and the two Solstice and Equinoxes. |
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