Sentences with phrase «as precession»

The Laurentide ice sheet that stretched as far south as New York State and Ohio some 20,000 years ago had retreated to eastern Canada, just across the water from Greenland, by roughly 11,000 years ago thanks to increased sunlight (due to the periodic wobble in Earth's axis known as precession).

Due to the slowly changing orientation of Earth's axis in space (which is also known as the Precession of the Equinoxes), Vega was the North Celestial Pole Star some 12,000 years ago and will be again in another 10,000 years.

The time for the orbit to return to its initial condition is known as a precession cycle.

The amount of solar radiation Earth receives during the Northern Hemisphere summer depends on where Earth's «wobble,» known as precession, is in its 23,000 - year cycle.

Their paths shift slightly from one orbit to the next — a phenomenon known as precession — but when astronomers use general relativity to predict the amount of this shift, their answers are off by a factor of four.

Not exact matches

Precession of equinox: Earth slowly wobbles as it spins, much like a toy top, while at the same time, Earth's rotational axis — the line from the north to south poles — rotates.

One is geodetic precession, in which the curvature of space - time around a massive object, such as Earth, induces a slight wobble in an orbiting gyroscope.

Vega periodically becomes our polestar as Earth's axis wobbles through its 26 - millennium precession.

The double pulsar PSR J0737 — 3039A / B consists of two neutron stars in a highly relativistic orbit that displays a roughly 30 - second eclipse when pulsar A passes behind pulsar B. Describing this eclipse of pulsar A as due to absorption occurring in the magnetosphere of pulsar B, we successfully used a simple geometric model to characterize the observed changing eclipse morphology and to measure the relativistic precession of pulsar B's spin axis around the total orbital angular momentum.

Firing an ultra-fast laser pulse at the material may completely flip the spin direction, reversing the magnetism, or may disrupt the spins, causing a kind of wobbling known as spin precession.

We interpret this periodicity as a property of the accretion disc, most likely a long - term precession, where the disc edge structure and X-ray irradiation is responsible for the hard X-ray dips and modulation, although we discuss other possible explanations, including Lense - Thirring precession in the inner disc region and spectral state variations.

Re 92 and 105: First I just want to reitterate more generally what 105 said — Milankovitch cycles have had climate signals, in ice ages or otherwise, — well probably ever since the Moon formed, although the signal from times past will not always reach us, but I've read of evidence of Milankovitch precession cycle forcing of monsoons in lakes in Pangea (PS over geologic time the periods of some of the Milankovitch cycles have changed as the Moon recedes from the Earth due to tides).

Precession: The Earth slowly wobbles as it spins, much like a toy top, while at the same time, the Earth's rotational axis — the line from the north to south poles — rotates.

[25] Also the observed position angles of the stars are also subject to small cumulative changes (additional to position angle changes caused by the Precession of the Equinoxes), as first determined by W. H. van den Bos in 1926.

Low obliquity makes it easier to accumulate ice at the poles, and the precession effects alternate between one pole and another as to where ice most easily persists.

Hence over the Plio - Pleistocene, East African climate is best characterised as a long - term trend towards increasing aridity punctuated by periods of precession - forced high rainfall leading to the periodic appearance of deep freshwater lakes.

One of these «remarkable effects» is a phenomenon known as «geodetic precession.»

Ceremonies include elaborate dances, precessions and music as well as Balinese cuisines and can be delicate, powerful or sinister.

As the Earth orbits the sun, the gravitational tug of the other planets slightly alters orbital characteristics (precession, tilt, ellipticity) on a timescale of tens of thousands of years.

But eccentricity modulates the effect of precession (the alignment of perihelion and aphelion with solstices or equinoxes)(actually, obliquity does modulate this too, but while obliquity variations have significant effect by themselves, they are relatively small in proportion to the difference with zero obliquity, whereas Earth's eccentricity variations include getting near zero, where aphelion and perihelion would have no effect as they wouldn't exist.

That passage could as well describe the vista that stretches now in front of us; the path we can take if we so choose: ecovillages, co-housing communities and other forms of living communally, practicing sustainable and regenerative, bioregionalist agriculture, in a permacultural landscape of cultivated ecologies, in millennial balance with the orbit and precession of Earth.

Eight thousand years ago Earth's orbit was closest to the sun in July because of precession, as you mentioned.

Raypierre also mentions an interesting idea (p. 467 of his textbook) about variations in precession and eccentricity largely cancelling due to Kepler's law, leaving variations in obliquity (~ 40kyr) as the largest effective forcing, with some nonlinearity (CO2?)

During periods of low eccentricity, such as about 400,000 years ago and during the next 100,000 years, seasonal insolation changes induced by precession are not as large as during periods of larger eccentricity (Box TS.6, Figure 1).

And, orbital tuning won't create exactly the * combination * of frequencies (as is clearest with precession cycles) that match the astronomical cycles.

The caloric summer half - year at 65 - N, defined as the energy received during the half of the year with the greatest insolation intensity (4), also has more than half its variance in the precession bands.

You must have failed to notice Coby that in those articles I link to (* & 312) I do mention that ONE «oscillator» is a TRIVARIATE of planetary orbital variation, planetary axial precession and Solar Climate as concerned with TOTAL, and Spectral division of, Solar energy output.

This theory stipulates that changes in Earth's elliptical orbit around the sun (eccentricity), changes in the direction in which our axis points (precession) and changes in the tilt of the earth itself (obliquity)-- known as Milankovitch Cycles — should contribute to changes in climate because of the different amounts of solar insolation received during these changes.

Be that as it may the planet is going over the hump in axial precession moving towards the favorable stage for glacial advance.

Oleg Sorokhtin of the Russian Academy of Sciences Institute of Ocean Studies, and many other Russian scientists maintain that global climate depends predominantly on natural factors, such as solar activity, precession (wobbling) of the Earth's axis, changes in ocean currents, fluctuations in saltiness of ocean surface water, and some other factors, whereas industrial emissions do not play any significant role.

This movement is known as «precession of the ecliptic» or «planetary precession».

As I noted above, DS proposal is that precession causes a warmer spring and day with the rest of warming following.

The concomitant quaternary glaciations on mars suggest response to changes to an external forcing, such as solar obliquity or precession, the concomitant changes to the martian prescape as of earth, to say obliquity would be remarkable coincidence of chance.

In December 1976 they published a landmark climate paper in Science, showing that climate records contained the same cycles as the three parameters that vary the Earth's orbit: eccentricity, obliquity and precession (shown in Figure 1).

In fact it simplifies analysis of Milankovich forcing to consider precession modulation and eccentricity as one and the same phenomenon.

Precession / obliquity — Precession very favorable while obliquity is lessening and becoming more favorable as compared to the Holocene Optimum period of time and this is why I think the global temperatures in general have been on a decline overall since the Holocene optimum however with fits and starts due to solar activity changes / volcanic activity and enso superimposed upon this general trend.

Precession, of course, is but one of three orbital eccentricities collectively known as Milankovitch cycles.

Strangely, Huyber's paper characterises the Hays, Imbrie and Shackleton 1976 solution as a «precession only» solution, whereas it manifestly and clearly identified all three Milankovitch components — eccentricity, tilt and precession, as involved.

He doesn't identify eccentricity as such in the title of the paper, but it is there in his orbital forcing model, as the amplitude modulation of precession, and needed for his model to work.

In a linear version of the Milankovitch theory, the two shorter cycles can be explained as responses to insolation cycles driven by precession and obliquity.