How To Use Perihelion In A Sentence
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Pluto, which has the greatest orbital eccentricity of any of the Solar System planets, was during those years at perihelion and actually closer than Neptune to the Sun.
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This happens around the time that Mercury arrives at that part of its orbit which places it closest to the Sun (called perihelion ), where it's orbital speed can briefly exceed its rotational speed.
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This happens around the time that Mercury arrives at that part of its orbit which places it closest to the Sun (called perihelion ), where it's orbital speed can briefly exceed its rotational speed.
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It was proved by Oppolzer [1286] that if the comet of 1843 had entered our system from stellar space with parabolic velocity it would, by the action of a medium such as Encke postulated (varying in density inversely as the square of the distance from the sun), have been brought down, by its first perihelion passage, to elliptic movement in a period of twenty-four years, with such rapid diminution that its next return would be in about ten.
A Popular History of Astronomy During the Nineteenth Century Fourth Edition
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Maximum gravitation force occurs when a syzygy and perigee occur on the same day as perihelion.
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But when the orbits become very eccentrical, we must consider this force as momentarily affecting a comet's velocity, diminishing it as it approaches the perihelion, and increasing it when leaving the perihelion.
Outlines of a Mechanical Theory of Storms Containing the True Law of Lunar Influence
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It is at the equinoxes that the earth changes her distances from the sun most rapidly, and whether she is passing from her perihelion or from her aphelion, the density of the ether externally is changing in the subduplicate ratio of these distances and consequently at these times there will be the greatest disturbance of the electric equilibrium.
Outlines of a Mechanical Theory of Storms Containing the True Law of Lunar Influence
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Variations in the timing of perihelion and aphelion are caused by a ‘wobbling’ in the Earth's axis of rotation as it rotates around the Sun.
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There is a small periodic effect called nutation superimposed on precession caused by the motion of the perihelion of the Moon.
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The radius vector is shortest when the planet is at perihelion and longest at aphelion.
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The difference between the perihelion and aphelion distances is about 3%, and therefore extraterrestrial irradiance is about 7% higher during the austral (Southern Hemisphere) summer than it is during the boreal (Northern Hemisphere) summer.
Factors affecting surface ultraviolet radiation levels in the Arctic
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The problem involved the advance of the perihelion of the planet Mercury.
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The small cross indicates the position of the Earth when at perihelion (closest approach to the Sun) in early January.
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In astronomical parlance, the comet which was slicing through Pisces and heading for the sun, has reached the ‘perihelion’ now.
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At the perihelion this excess of tangential velocity creates a resistance, which urges the planet towards the sun, and at the aphelion, the deficiency of tangential velocity urges the planet from the sun, -- the maximum effect being at the apsides of the orbit, and null at the mean distances.
Outlines of a Mechanical Theory of Storms Containing the True Law of Lunar Influence
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Saturn in Cancer at the time of the perihelion inclines you to deal with issues of home, family, security, finances, and relationships.
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For objects orbiting Earth, periapsis and apoapsis are known as perigee and apogee; for objects orbiting the Sun, these locations are known as perihelion and aphelion.
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With aching finality, the moon unseen reached its perihelion in the sky and the hour sounded the twelve chimes of middle night.
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When the orbit is more elliptical, the perihelion is closer to the Sun and the aphelion is farther away than when the orbit is more circular.
Milankovitch cycles
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This affects the climate because the influx of solar energy to our planet would then vary between perihelion and aphelion by a larger proportion than at present.
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In other positions it is, therefore, as the cosines of the eccentric anomaly, as in the former case; but in this last case it is an addititious force at the perihelion, and an ablatitious force at the aphelion, whereas the first disturbing force was an ablatitious force at the perihelion, and an addititious force at the aphelion; therefore, as we must suppose the planet to be in equilibrium at its mean distance, it is in equilibrium at all distances.
Outlines of a Mechanical Theory of Storms Containing the True Law of Lunar Influence
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Certainly the book would be more compelling if it contained a success story on a par with accounting for the periods of the planetary orbits or the perihelion shift of Mercury.
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This affects the climate because the influx of solar energy to our planet would then vary between perihelion and aphelion by a larger proportion than at present.
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This means that the Earth moves faster along the orbit in winter near perihelion .
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It orbits the sun on a highly elliptical path which, even at its perihelion, puts the planetoid more than twice the average distance from the Sun to Pluto.
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The Sun keeps a tight rein on Mercury this month because the planet's greatest elongation falls on the day before its perihelion, when it is physically closest to the Sun.
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So whether or not Pluto is moving towards perihelion or aphelion that doesn't determine its "spring" or "autumn", does it?
New Hubble Images Show Pluto is Changing | Universe Today
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In all this Cuban business there is one man stands out on the horizon of my memory like Mars at perihelion .
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The Perihelion Foundation (now officially an agency of the government) wasn't part of NASA, although it "interfaced" with NASA, borrowing and lending engineers and staff.
Spin
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For example, Einstein's Relativity Theory got support from the fact that it correctly implied the precession of the perihelion of Mercury, though that information was known long before Einstein formulated the theory.
Confirmation Bias and ID
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Dr. Wollaston had made a drawing of the orbit and its elements; but, having left it in town, he described the lines so accurately without naming them, that I remarked at once, "That is the curtate or perihelion distance," which pleased him greatly, as it showed how accurate his description was.
Personal Recollections, from Early Life to Old Age, of Mary Somerville
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There are small cyclic variations in those apparent sizes because the Earth-Moon distance changes as the latter moves between perigee and apogee, and the Earth-Sun separation alters as the former moves between perihelion and aphelion.
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Figure 1: Position of the equinoxes, solstices, aphelion, and perihelion on the Earth's orbit.
Earth-Sun geometry
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He calculated to within a month the return in 1759 of Halley's comet to its perihelion (closest point to the Sun).
