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saros    音标拼音: [s'ɑros]
沙罗周期

沙罗周期

Saros \Sa"ros\, n. [NL., fr. Gr. ?] (Astron)
A Chaldean astronomical period or cycle, the length of which
has been variously estimated from 3,600 years to 3,600 days,
or a little short of 10 years. --Brande & C.
[1913 Webster]
[1913 Webster]


Cycle \Cy"cle\ (s?"k'l), n. [F. ycle, LL. cyclus, fr. Gr.
ky`klos ring or circle, cycle; akin to Skr. cakra wheel,
circle. See {Wheel}.]
1. An imaginary circle or orbit in the heavens; one of the
celestial spheres. --Milton.
[1913 Webster]

2. An interval of time in which a certain succession of
events or phenomena is completed, and then returns again
and again, uniformly and continually in the same order; a
periodical space of time marked by the recurrence of
something peculiar; as, the cycle of the seasons, or of
the year.
[1913 Webster]

Wages . . . bear a full proportion . . . to the
medium of provision during the last bad cycle of
twenty years. --Burke.
[1913 Webster]

3. An age; a long period of time.
[1913 Webster]

Better fifty years of Europe than a cycle of Cathay.
--Tennyson.
[1913 Webster]

4. An orderly list for a given time; a calendar. [Obs.]
[1913 Webster]

We . . . present our gardeners with a complete cycle
of what is requisite to be done throughout every
month of the year. --Evelyn.
[1913 Webster]

5. The circle of subjects connected with the exploits of the
hero or heroes of some particular period which have served
as a popular theme for poetry, as the legend of Arthur and
the knights of the Round Table, and that of Charlemagne
and his paladins.
[1913 Webster]

6. (Bot.) One entire round in a circle or a spire; as, a
cycle or set of leaves. --Gray.
[1913 Webster]

7. A bicycle or tricycle, or other light velocipede.
[1913 Webster]

8. A motorcycle.
[PJC]

9. (Thermodynamics) A series of operations in which heat is
imparted to (or taken away from) a working substance which
by its expansion gives up a part of its internal energy in
the form of mechanical work (or being compressed increases
its internal energy) and is again brought back to its
original state.
[Webster 1913 Suppl.]

10. (Technology) A complete positive and negative, or forward
and reverse, action of any periodic process, such as a
vibration, an electric field oscillation, or a current
alternation; one period. Hence: (Elec.) A complete
positive and negative wave of an alternating current. The
number of cycles (per second) is a measure of the
frequency of an alternating current.
[Webster 1913 Suppl. PJC]

{Calippic cycle}, a period of 76 years, or four Metonic
cycles; -- so called from Calippus, who proposed it as an
improvement on the Metonic cycle.

{Cycle of eclipses}, a period of about 6,586 days, the time
of revolution of the moon's node; -- called {Saros} by the
Chaldeans.

{Cycle of indiction}, a period of 15 years, employed in Roman
and ecclesiastical chronology, not founded on any
astronomical period, but having reference to certain
judicial acts which took place at stated epochs under the
Greek emperors.

{Cycle of the moon}, or {Metonic cycle}, a period of 19
years, after the lapse of which the new and full moon
returns to the same day of the year; -- so called from
Meton, who first proposed it.

{Cycle of the sun}, {Solar cycle}, a period of 28 years, at
the end of which time the days of the month return to the
same days of the week. The dominical or Sunday letter
follows the same order; hence the solar cycle is also
called the {cycle of the Sunday letter}. In the Gregorian
calendar the solar cycle is in general interrupted at the
end of the century.
[1913 Webster]


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  • Saros (astronomy) - Wikipedia
    The saros ( ˈ s ɛər ɒ s ⓘ) is a period of exactly 223 synodic months, [a] 18 years 11 days and 8 hours, [2] [1] that can be used to predict eclipses of the Sun and Moon One saros period after an eclipse, the Sun, Earth, and Moon return to approximately the same relative geometry, a near straight line, and a nearly identical eclipse will occur, in what is referred to as an eclipse cycle
  • NASA - Eclipses and the Saros
    The Saros series columns were then staggered so that the interval between any two eclipses in adjacent columns was 10571 95 days (= 29 years -20 days) This is another important eclipse cycle called the Inex The resulting Saros-Inex Panorama proved useful in organizing eclipses For instance, one step down in the panorama is a change of one
  • What is the Saros Cycle and How Does It Foretell Eclipses?
    This is because the saros cycle is actually 6,585 32 days long — that extra 0 32 of a day means that the earth sneaks in an extra ⅓ of a spin on its axis The second difference is that the Great American Eclipse took place very slightly to the south of the 1999 event The reason for this is that the saros cycle is not perfect
  • Saros | Lunar-Solar Cycle, Eclipse Prediction Astronomy | Britannica
    saros, in astronomy, interval of 18 years 11 1 3 days (10 1 3 days when five leap years are included) after which the Earth, Sun, and Moon return to nearly the same relative positions and the cycle of lunar and solar eclipses begins to repeat itself; e g , the solar eclipse of June 30, 1973, was followed by one of roughly the same latitude and duration on July 11, 1991
  • Saros Cycle – Definition Detailed Explanation - Sentinel Mission
    By understanding the patterns of the Saros Cycle, astronomers can forecast solar and lunar eclipses years in advance, giving them the opportunity to study these celestial events and learn more about the workings of the solar system Additionally, the Saros Cycle has been used by ancient civilizations to track time and predict celestial events
  • What Is The Saros Cycle? - Astrophoto Guru
    Each Saros cycle results in a series of eclipses, called a Saros series These series can last for 1226 to 1550 years, containing between 69 and 87 eclipses Each eclipse within a series has a similar path across Earth, but due to the slight shift in the Moon’s node, the series gradually moves westward across the globe by approximately 1 3
  • Saros - Solar System Astronomy
    "The Saros Cycle" by Fred Espenak (NASA): An excellent overview of the Saros cycle, explaining its mechanics and historical significance "Eclipses and the Saros Cycle" by Brian Tung (Universe Today): A simplified explanation of the Saros cycle with illustrations "The Mystery of the Saros Cycle" by David H Levy (Sky Telescope): An engaging article exploring the historical discovery and
  • Determining the Saros - Astronomical League - ASTROLEAGUE
    Saros cycles usually start and end at the poles, usually with poor partial eclipses seen only by polar bears #1 of Cycle 139 occurred on May 17,1501, as a partial eclipse of the sun with 9% covered The “Last of Us” moment for Cycle 139 will occur on July 3, 2763 at 6% covered for the penguins to watch as they stand on their eggs
  • How Did the Ancients Predict Eclipses? The Saros Cycle
    Also, the 5-hour, 11-minute difference between the draconic and anomalistic months in the saros means the Moon's distance will gradually change between each member within a saros series — at some point the series could change from total to annular or vice versa A saros series typically lasts 12 or 13 centuries and contains 70 or more eclipses
  • Index to Catalog of Saros Series of Solar Eclipses - NASA Eclipse Web Site
    Solar Eclipses of Saros Series 0 to 180 The periodicity and recurrence of solar eclipses is governed by the Saros cycle, a period of approximately 6,585 3 days (18 years 11 days 8 hours) When two eclipses are separated by a period of one Saros, they share a very similar geometry





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