Cycle
Related Category: Astronomy: General
in astronomy, period of time required for the recurrence of some celestial event. The length of a cycle may be measured relative to the sun or to the fixed stars (see sidereal time).
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Epicycle
From LoveToKnow 1911
EPICYCLE (Gr. Esri, upon, and icbsXos, circle), in ancient astronomy, a small circle the centre of which describes a larger one.
CNO cycle
Overview of the CNO Cycle.
The CNO (carbon-nitrogen-oxygen) cycle is one of two fusion reactions by which stars convert hydrogen to helium, the other being the proton-proton chain.
CNO cycle
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The CNO cycle (for carbon-nitrogen-oxygen), or sometimes Bethe-Weizsäcker-cycle, is one of two fusion reactions by which stars convert hydrogen to helium, ...
Solar cycle
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Sunspot Cycle
A daily count of the number of sunspots visible on the Sun (the Wolf number or Zurich sunspot number) shows a periodic variation with maxima occuring (on average) every 11 years.
"In cycles 21 through 23, solar maximum occurred when this rush appeared at an average latitude of 76 degrees," says Altrock. Typically, new solar activity emerges first at about 70 degrees latitude, trending towards the equator as the cycle ages.
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Each cycle also results in the formation of two or three neutrinos, having mean energies of: nu(1) = 0.710 MeV, nu(2) = 1.00 MeV, and nu(3) = 0.94 MeV.
Lunar Cycles
: A lunar cycle noted by Callippus in 325 BC which included 4 19-year . The 940 months had 29 or 30 days each, for a total of 27,759 days. : Four less a day, in which days are very nearly 3760 months.
SOLAR CYCLE - Solar activity increases and decreases over an 11 year cycle. Scientists can pretty well predict when our Sun is going to be active and when it is going to be quiet, but not always.
Solar Cycles. No human has visited the surface of the Sun, of course, but from Earth we can see sunspots varying on the face of the Sun in eleven-year activity cycles.
Saros cycles don't last forever or indefinitely, because realignments of full Moon with its node are not perfect. A typical Saros series consists of 69 to 86 eclipses spanning well over a thousand years.
THE LIFE CYCLE OF STARS
Stars are born in nebulae. Huge clouds of dust and gas collapse under gravitational forces, forming protostars. These young stars undergo further collapse, forming main sequence stars.
Star Life Cycle Label Me Answers
This is a thumbnail of the Label the Star Life Cycle Answers picture. The full-size printout is available only to site members.
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Io's "Water Cycle"
A feature of great interest is illustrated by the flat-topped mesa in this image. The mesa surrounds a giant calder of the Tvashtar Catena crater chain.
The Solar Cycle
The Sun is a large ball of hot gases. It has a very strong magnetic field. You can think of the Sun as having a large bar magnet going straight through its center.
The average latitude of those bands varies with the solar cycle. Just after the minimum of the solar cycle, sunspots appear at an average latitude of about 25 - 30 degrees (both north and south of the equator).
Definition: solar cycle: The approximately 11-year quasi-periodic variation in frequency or number of solar active events.
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epicycle A construct of the geocentric model of the solar system which was necessary to explain observed planetary motions. Each planet rides on a small epicycle whose center in turn rides on a larger circle (the deferent).
epicycle: a small circle whose centre moves around the circumference of a larger one. It was proposed as the shape of the orbit of some of the planets by Ptolemy.
Epicycle
An attempt to explain the retrograde loop in the earth centered universe, by attaching the planets to epicycles and having them revolve around that, and in turn around the earth.
Equant ...
epicycle: The small circle followed by a planet in the Ptolemaic theory. The center of the epicycle follows a larger circle (deferent) around Earth.
Epicycle - One of the circles upon which a planet moved according to the Ptolemaic (geocentric) model of the solar system. The center of the epicycle moved on a larger circle, called the deferent ...
Epicycle
(a) Circular orbit of a body round a point that is itself in a circular orbit round a parent body. Such a system was formulated to explain some planetary orbits in the Solar System before they were known to be elliptical. [A84] ...
CNO Cycle
Stars with a mass of about 1.5 solar masses or more produce most of their energy by a different form of hydrogen fusion, the CNO cycle. CNO stands for carbon, nitrogen and oxygen as nuclei of these elements are involved in the process.
CNO CYCLE - Fusion process in stars contaminated by "metals," specifically carbon (C), nitrogen (N), and oxygen (O).
Epicycle -- A circle around a point which (in the simplest form of Ptolemy's system) moved steadily around the celestial sphere.
Motorcycle speedway, usually referred to as speedway, is a motorcycle sport involving four and sometimes up to six riders competing over four clockwise laps of an oval circuit....
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Solar Cycle. The approximately 11-year quasi-periodic variation in frequency or number of solar active events.
lunar cycle
The cycle of the lunar phases during one synodic month.
lunar eclipse
An eclipse which occurs when the Moon passes through the Earth's shadow.
sunspot cycle
a cycle averaging 11 years in which the number of sunspots increases and decreases
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Metonic cycle. The period of 6 939.6 days, or 19 calendar years, after which the Moon's phases recur on the same day of the year. This period is also equal to 253 lunations.
a cycle averaging 11 years in which the number of sunspots increases and decreases.
superior conjunction
the configuration of an inferior planet when it lies on the far side of the sun ...
EPICYCLE
Epicycles are circular orbits within orbits that were used to (incorrectly) describe the orbits of objects in the Ptolemaic system (about A.D. 150).
Sun Cycles
June 2011 -- Currently the sun seems to be heading into a period called Solar Maximum the period of greatest solar activity in the solar cycle of the sun. During solar maximum, sunspots appear.
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CNO cycle: A series of nuclear reactions that convert 4 hydrogen into 1 helium nucleus. The process starts with the capture of a proton (hydrogen nucleus) onto Carbon turning it into Nitrogen.
CNO cycle - (n.)
A nuclear-fusion-reaction sequence in which hydrogen nuclei are combined to form helium nuclei, and in which other nuclei, such as isotopes of carbon, oxygen, and nitrogen, appear as catalysts or by-products.
moon cycle
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Fuel cycle
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This cycle was almost certainly known to the ancient Babylonians and was possibly used by Thales around 585 BC.
Solar Cycle
The periodic changing of the Sun's magnetic field, which determines the number of sunspots and the amount of particles emitted in the solar wind. The period of the cycle is about 11 years.
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Saros cycle
A period of 18 years 11.3 days in which eclipses repeat themselves.
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The epicycle and deferent are a way to explain the retrograde motions of the outer planets. The deferent is the large circle that is also eccentric (Earth not in the middle), and upon this large circle, the epicycle is locatd.
The CNO cycle is faster and more energy is produced per second. In order to effectively transport the heat energy out from the star, its core has to be convective. The outer part of the star is still quite hot that gas is not too opaque.
KT 101 Cycles, set of 10 booklets
Adults and older children will love this friendly pocket-sized guide! Restore a natural awareness of the cycles of our planet, lost today by modern man's dependence on clocks and calendars.
The sunspot cycle returns to a minimum after approximately 11 years. At sunspot minimum there are at most a few small spots on the Sun, usually at low latitudes. New-cycle spots begin to emerge at higher latitudes, between 25 and 40.
carbon cycle (NASA Thesaurus) The path of carbon in living beings in which carbon dioxide is fixed by photosynthesis to form organic nutrients and ultimately restored to the inorganic state by respiration and protoplasmic decay.
carbon cycle A sequence of atomic nuclear reactions and spontaneous radioactive decay which serves to convert matter into energy in the form of radiation and high-speed particles, ...
silicate a compound containing silicon and oxygen (e.g. olivine) sinus literally "bay"; really a small plain solar cycle the approximately 11-year quasi-periodic variation in frequency or number of solar active events.
The passage of a celestial body or point across the ephemeris meridian. [S92]
Epicycle ...
epicycle a device in Ptolemy's Earth-centered model that makes a planet execute a small circular motion around a point that is itself in a circular orbit around the Earth. It was used to explain retrograde motion.
Edit Stellar life cycle
Edit Formation
Stars are born out of huge gaseous nebulae. Inside these nebulae, centers of higher density form, slowly accumulating more mass as the center's gravity increases, to form a protostar.
GLEs are relatively rare, occur- ring only a few times each SOLAR CYCLE. H-ALPHA. This ABSORPTION LINE of neutral hydrogen falls in the red part of the visible spectrum and is convenient for solar observations.
A unit of frequency equal to one cycle per second. One kHz = 1000 Hz. One MHz = 106 (one million) Hz. One GHz = 109 Hz.
Hydromagnetic Wave A wave in which both the plasma and magnetic field oscillate.
The top graph shows the visual (V) light curve of Beta Doradus over two cycles, where "phase" is the relative period, which begins with maximum light at 0 and ends with maximum light at 1.
Anomalies in a planet's motion were accounted for by the use of the epicycle, a circle centered on the circumference of a larger circle called the deferent.
 See also: Earth, Time, Sun, Light, Solar
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