There is a large number of amateur astronomical societies around the world that serve as a meeting point for those interested in amateur astronomy, whether they be people who are actively interested in observing or " armchair astronomers " who may simply be interested in the topic.

Astrology consists of a number of belief systems which hold that there is a relationship between astronomical phenomena and events in the human world.

To reconcile the calendar year with an astronomical cycle ( which could not possibly be reckoned in a whole number of days ), certain years contain extra days.

A number of experimenters initially claimed to have identified the effect using astronomical measurements, and the effect was eventually considered to have been finally identified in the spectral lines of the star Sirius B by W. S.

where d is the number of days since 1 January 2000 00: 00: 00 in the Terrestrial Time scale used in astronomical ephemerides ; for Universal Time ( UT ) add the following approximate correction to d:

Because seasons and astronomical events do not repeat in a whole number of days, a calendar that had the same number of days in each year would, over time, drift with respect to the event it was supposed to track.

If there were a large ( possibly infinite ) number of universes, each with possibly different physical laws ( or different fundamental physical constants ), some of these universes, even if very few, would have the combination of laws and fundamental parameters that are suitable for the development of matter, astronomical structures, elemental diversity, stars, and planets that can exist long enough for life to emerge and evolve.

Today, the astronomical community widely agrees that Planet X, as originally envisioned, does not exist, but the concept of Planet X has been revived by a number of astronomers to explain other anomalies observed in the outer Solar System.

No astronomical year has an integer number of days or lunar months, so any calendar that follows an astronomical year must have a system of intercalation such as leap years.

* 4713 BC: The epoch ( origin ) of the Julian Period described by Joseph Justus Scaliger occurred on January 1, the astronomical Julian day number zero.

The astronomical measurements taken of the transit of Venus by a number of countries since 1639 resulted in a progressively more accurate definition of the AU.

This section of Rules for philosophy is followed by a listing of ' Phenomena ', in which are listed a number of mainly astronomical observations, that Newton used as the basis for inferences later on, as if adopting a consensus set of facts from the astronomers of his time.

Because of the astronomical number of possible cladograms, algorithms cannot guarantee that the solution is the overall best solution.

In 1969, Cyrus Levinthal noted that, because of the very large number of degrees of freedom in an unfolded polypeptide chain, the molecule has an astronomical number of possible conformations.

It was only after Claver's death that the vast scope of his ministry came to be realized ; which was prodigious even before the astronomical number of people he baptized is added in.

The Elqui Valley is home to a number of astronomical observatories, owing to the region's clear skies.

Several poetical works on various subjects, as well as a number of prose epistles, are attributed to Aratus, but none of them have come down to us, except his two astronomical poems in hexameter.

Smyth moved to Stone near Aylesbury in 1842, and still had the opportunity to use the telescope since his residence at St. John's Lodge was not far from its new location, and he performed a large number of additional astronomical observations from 1839 to 1859.

It would have been natural to think that the number of seven archons was suggested to Saturninus by astronomical considerations ; and this supposition is verified by the statement in the later chapter ( c. 30 ) that the holy Hebdomas are the seven stars called planets.

The number of his astronomical publications exceeds 150, but his reputation depends mainly on his earlier work at Greenwich and his two great star catalogues — the Cape catalogue for 1880 and the Radcliffe catalogue for 1890.

Today, in addition to performing continuing science operations of HST and preparing for scientific exploration with JWST, STScI manages and operates the Multi-mission Archive at Space Telescope ( MAST ), the Data Management Center for the Kepler mission and a number of other activities benefiting from its expertise in and infrastructure for supporting the operations of space-based astronomical observatories.

A number of countries have legally adopted ISO 8601, also used in other contexts, which uses the astronomical calendar, in which year counting starts at 0.

If a nation wished to get a head start in physical fitness over all other nations, it would start its kindergarten students on a program of gymnastics the day they entered and thus eliminate a large number of the problems that plague American schools.

Although there is no question but that the process of washing fabrics involves a number of phenomena which are related together in an extremely complicated way and that these phenomena and their interrelations are not well understood at the present, this section attempts to present briefly an up-to-date picture of the physical chemistry of washing either fabrics or hard surfaces.

Of this number, 50%, or 10 million patients have no diagnosable physical ailments whatever.

Furthermore, the middle number of the Lo Shu is not only the physical mean between every opposing pair of the other numbers, by reason of its central position ; ;

Only after 1915, with the suggestion and evidence that this Z number was also the nuclear charge and a physical characteristic of atoms, did the word and its English equivalent atomic number come into common use.

Until these experiments, atomic number was not known to be a physical and experimental quantity.

Long-term alcohol abuse can cause a number of physical symptoms, including cirrhosis of the liver, pancreatitis, epilepsy, polyneuropathy, alcoholic dementia, heart disease, nutritional deficiencies, peptic ulcers and sexual dysfunction, and can eventually be fatal.

With repeated heavy consumption of alcohol, these receptors are desensitized and reduced in number, resulting in tolerance and physical dependence.

With repeated heavy consumption of alcohol, these receptors are desensitized and reduced in number, resulting in tolerance and physical dependence.

The Book of Mormon has a number of original and distinctive doctrinal discussions on subjects such as the fall of Adam and Eve, the nature of the Atonement, eschatology, redemption from physical and spiritual death, and the organization of the latter-day church.

* trace the evolution of a large number of organisms by measuring changes in their DNA, rather than through physical taxonomy or physiological observations alone,

Amateur boxing has a point scoring system that measures the number of clean blows landed rather than physical damage.

This article gives lists of conversion factors for each of a number of physical quantities, which are listed in the index.

For each physical quantity, a number of different units ( some only of historical interest ) are shown and expressed in terms of the corresponding SI unit.

The properties of the chemical elements are often summarized using the periodic table that organizes the elements by increasing atomic number into rows (" periods ") in which the columns (" groups ") share recurring (" periodic ") physical and chemical properties.

The properties of the chemical elements are often summarized using the periodic table, which powerfully and elegantly organizes the elements by increasing atomic number into rows (" periods ") in which the columns (" groups ") share recurring (" periodic ") physical and chemical properties.

Johann Carl Friedrich Gauss (;, ) ( 30 April 177723 February 1855 ) was a German mathematician and physical scientist who contributed significantly to many fields, including number theory, statistics, analysis, differential geometry, geodesy, geophysics, electrostatics, astronomy and optics.

* Maximal possible number of writes ( of any specific bit or specific group of bits ; could be constrained by the technology used ( e. g., " write once " or " write twice "), or due to " physical bit fatigue ," loss of ability to distinguish between the 0, 1 states due to many state changes ( e. g., in Flash memory )).

* Maximal possible number of writes ( of any specific bit or specific group of bits ; could be constrained by the technology used ( e. g., " write once " or " write twice "), or due to " physical bit fatigue ," loss of ability to distinguish between the 0, 1 states due to many state changes ( e. g., in Flash memory )).

One strength of a DBMS is that while there is typically only one conceptual ( or logical ) and physical ( or internal ) view of the data, there can be an endless number of different external views.

A number of different chemical and physical processes and mechanisms can be involved in the process of emulsification:

Until recently, before the accession of Free Mobile in Junary 2012, the number of physical mobile phone operators was very limited.

In particular they pointed out a number of doubts about the physical reasons of the radial gravity, and hesitated in accepting the physical reasons proposed by Aristotle or Stoicism.