In 1258, when both North China and the Islamic world were part of the Mongol Empire, Hulagu Khan established an observatory in Maragheh for the astronomer Nasir al-Din al-Tusi at which a few Chinese astronomers were present, resulting in the Chinese-Uighur calendar that al-Tusi describes in his Zij-i Ilkhani.

Although Greek astronomers had known, at least since Hipparchus, that the tropical year was a few minutes shorter than 365. 25 days, the calendar did not compensate for this difference.

For almost two millennia, the geocentric model had been accepted by all but a few astronomers.

Despite the difficulties of observing the sun directly, they noted the existence of sunspots, the first confirmed instance of their observation ( though unclear statements in East Asian annals suggest that Chinese astronomers may have discovered them with the naked eye previously, and Fabricius may have noticed them himself without a telescope a few years before ).

Halley's appearance in 12 BCE, only a few years distant from the conventionally assigned date of the birth of Jesus Christ, has led some theologians and astronomers to suggest that it might explain the biblical story of the Star of Bethlehem.

Amateur astronomers have contributed to many important astronomical discoveries, and astronomy is one of the few sciences where amateurs can still play an active role, especially in the discovery and observation of transient phenomena.

With very low light capability, few specific models of Webcams are very popular to shoot night sky by astronomers and astro photographers.

They include mountain climbers ( Heidi Howkins, class of 1989, the only woman to lead expeditions to both Everest and K-2 ), authors ( such as Harriet Stratemeyer Adams, class of 1914, pen name Carolyn Keene ), astronomers ( including Annie Jump Cannon, class of 1884, who developed the well-known Harvard Classification of stars based upon temperature ), screenwriters, ( including Nora Ephron, class of 1962, famous for such films as When Harry Met Sally and Sleepless in Seattle ), journalists ( Linda Wertheimer, class of 1965, Lynn Sherr, class of 1963, Diane Sawyer, class of 1967, and Cokie Roberts, class of 1964, being a few notable examples ), entrepreneurs ( including Robin Chase, class of 1980, the co-founder of ZipCar ), mathematicians ( Winifred Edgerton Merrill, class of 1883, was the first woman to ever receive a PhD in mathematics ), judges ( including Jane Bolin, class of 1928, the first African-American woman to become a judge, and current federal appeals judges Reena Raggi, Amalya Kearse, and Susan P. Graber ).

While plasma cosmology has never had the support of most astronomers or physicists, a few researchers have continued to promote and develop the approach, publishing mostly in the IEEE journal Transactions on Plasma Science.

However, few professional astronomers found this evidence of volcanic activity on the Moon very convincing.

In this arrangement the telescope aperture is blocked by astronomers apart from a few holes which allow light through, creating a small optical interferometer with better resolving power than the telescope would otherwise have.

In preparation for the setup of this mission, astronomers analyzed the radio-based position measurements with respect to far distant quasars taken over the last few years to understand its motion as precisely as needed.

Since professional astronomers do not have the time or the resources to monitor every variable star, astronomy is one of the few sciences where amateurs can make genuine contributions to scientific research.

It was also independently discovered a few weeks later by another team of astronomers working with Effelsberg 100-m Radio Telescope.

However, astronomers believe that it would not cause major damage to the capability of the galaxy to support life because galaxies are so diffuse that very few, if any, planets and stars would collide.

Despite the difficulties of observing the sun directly, they noted the existence of sunspots, the first confirmed instance of their observation ( though unclear statements in East Asian annals suggest that Chinese astronomers may have discovered them with the naked eye previously, and Fabricius may have noticed them himself without a telescope a few years before ).

He said that many Jesuits were theologians, but few were astronomers.

From 1957 – 1959 he served as president of the Royal Astronomical Society, one of the few amateur astronomers to do so.

Observing changes in such objects allows astronomers to determine if their spatial extension is “ small ” or “ large ”, in the sense that notable changes in an object as vast as our Milky Way cannot be seen over a small time period, such a few years, while such changes are possible if the size of the object does not exceed a few light-years.

When astronomers discovered SN 1994I in the Whirlpool Galaxy a few days later, they realized that the observations made with the telescope at Leuschner had captured the earliest images of the supernova.

Astronomy is sometimes promoted as one of the few remaining sciences for which amateurs can still contribute useful data.

In particular, home versions of arcade games sometimes had problems with flickering and slow down when more than a few moving objects appeared on the screen at once.

It is sometimes described as having a torrent-like behaviour, because it can easily go from almost dry to near-flood in a few days.

A few library schools sometimes taught the BC system to their students, but only in a minor way.

An obsession emerges among the mainstream with the new movement, and the old one falls into neglect-sometimes it dies out entirely, but often it chugs along favored in a few disciplines and occasionally making reappearances ( sometimes prefixed with " neo -").

Towards the end of its life there were so few passengers that diesel railcars were sometimes used.

Cabals are sometimes secret societies composed of a few designing persons, and at other times are manifestations of emergent behavior in society or governance on the part of a community of persons who have well established public affiliation or kinship.

These are most often temporary effects: hair usually starts to regrow a few weeks after the last treatment, sometimes with a tendency to curl, resulting in " chemo curls.

The fibers making up a yarn may be continuous filament fibers such as silk and many synthetics, or they may be staples ( fibers of an average length, typically a few inches ); naturally filament fibers are sometimes cut up into staples before spinning.

The Digimon series has a large number of video games which usually have their own independent storylines with a few sometimes tying into the stories of the anime series or manga series.

Over the next few years Eleanor often traveled with her husband and was sometimes associated with him in the government of the realm, but still had a custodian so that she was not free.

However, few real-world applications exist in closed isolation, and it is for this reason that two or more closed systems cannot be compared using enthalpy as a basis, although sometimes this is done erroneously.

ET-related tremors do not occur during sleep, but patients sometimes complain of an especially coarse tremor upon awakening that becomes noticeably less coarse within the first few minutes of wakefulness.

Indeed, according to various historical accounts, after that point few mathematicians tackled the issues and the work of those who did remained obscured largely because of resistance to such unfamiliar emerging concepts, which were sometimes referred to as mathematical " monsters ".

Forests sometimes contain many tree species only within a small area ( as in tropical rain and temperate deciduous forests ), or relatively few species over large areas ( e. g., taiga and arid montane coniferous forests ).

A few fanzines have evolved into professional publications ( sometimes known as " prozines "), and many professional writers were first published in fanzines ; some continue to contribute to them after establishing a professional reputation.

One distinction is that gardening is labor-intensive and employs very little infrastructural capital, sometimes no more than a few tools, e. g. a spade, hoe, basket and watering can.

However, even in those languages where the original three genders have been mostly lost or reduced, there is sometimes a trace of them in a few words.

In gymnosperms and angiosperms, the gametophyte are reduced to only a few cells ; in angiosperms the female gametophyte ( sometimes called the " embryo sac ") is known as a megagametophyte and the male gametophyte ( pollen ) is called a microgametophyte.

When hair is trimmed, only the first few centimeters need to be removed, whereas haircuts can sometimes result in the loss of many inches of hair.

Since hedge funds are private entities and have few public disclosure requirements, this is sometimes perceived as a lack of transparency.

It comes that sometimes the melody disappears and only few bizarre accords reads.

The fibers making up a yarn may be continuous filament fibers such as silk and many synthetics, or they may be staples ( fibers of an average length, typically a few inches ); naturally filament fibers are sometimes cut up into staples before spinning.

In general, Common Kestrels will usually tolerate conspecifics nesting nearby, and sometimes a few dozen pairs may be found nesting in a loose colony.

Sometimes these reductions consisted of set-theoretic manipulations of a few logically primitive concepts ( as in Carnap's ( 1928 ) Logical Structure of the World ); sometimes these reductions consisted of allegedly analytic or a priori deductive relationships ( as in Carnap's Testability and Meaning ).