In astronomy, a given point on the celestial sphere ( that is, the apparent position of an astronomical object ) can be identified using any of several astronomical coordinate systems, where the references vary according to the particular system.

However, the defining recommendation indicates a change to a system similar to ISO 8601 and astronomical year numbering is likely in the future.

He made observations of eclipses and various astronomical objects and published catalogues of carefully determined magnitudes for some 300 stars using his own photometric system ( mean error = 0. 4 mag ).

Even where there is a commonly used calendar such as the Gregorian calendar, alternate calendars may also be used, such as a fiscal calendar or the astronomical year numbering system.

Another " ordinal " date system (" ordinal " in the sense of advancing in value by one as the date advances by one day ) is in common use in astronomical calculations and referencing and uses the same name as this " logistics " system.

Unlike the system described above, the astronomical system does not consider years, it only counts days.

Johannes Kepler's first major astronomical work, Mysterium Cosmographicum ( The Cosmographic Mystery ), was the first published defense of the Copernican system.

After failing to find a unique arrangement of polygons that fit known astronomical observations ( even with extra planets added to the system ), Kepler began experimenting with 3-dimensional polyhedra.

By assuming the Earth to possess a soul ( a property he would later invoke to explain how the sun causes the motion of planets ), he established a speculative system connecting astrological aspects and astronomical distances to weather and other earthly phenomena.

However, it is useful in generating corrections of astronomical models, to prove of long-termed stability and of avoiding of orbital resonance in solar system.

* Project Orion, a 1980 NASA astrometry study of a system of methods of detecting extrasolar planets using astronomical interferometry

In discussing the work of Pytheas, Strabo typically uses direct discourse: " Pytheas says ..." In presenting his astronomical observations, he changes to indirect discourse: " Hipparchus says that Pytheas says ..." either because he never read Pytheas ' manuscript ( because it was not available to him ) or in deference to Hipparchus, who appears to have been the first to apply the Babylonian system of representing the sphere of the earth by 360 °.

Right ascension ( abbreviated RA ; symbol α ) is the astronomical term for one of the two direction coordinates of a point on the celestial sphere in the equatorial coordinate system, usually combined with declination.

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.

The Persian calendar, in use in Afghanistan and Iran, has its year begin on the day of the vernal equinox as determined by astronomical computation ( for the time zone of Tehran ), as opposed to using an algorithmic system of leap years.

Three hundred years later, the American astronomical historian William Ashworth suggested that what Flamsteed may have seen was the most recent supernova in the galaxy's history, an event which would leave as its remnant the strongest radio source outside of the solar system, known in the third Cambridge ( 3C ) catalogue as 3C 461 and commonly called Cassiopeia A by astronomers.

To this day, the Hubble sequence is the most commonly used system for classifying galaxies, both in professional astronomical research and in amateur astronomy.

Newton lists the astronomical observations on which he relies ( in ' The Phaenomena '), and establishes in a stepwise manner that the inverse square law of mutual gravitation applies to solar system bodies, starting with the satellites of Jupiter and going on by stages to show that the law is of universal application.

Asimov here is drawing attention to an astronomical curio: the nearest star system to Sol contains a star that has the same spectral type, G2 V, though Alpha Centauri A is a little larger and brighter.

* The Jet Propulsion Laboratory Developmental Ephemeris ( JPL DE ) is a widely used model of the solar system, which combines celestial mechanics with numerical analysis and astronomical and spacecraft data.

In the classical naming system, acids are named according to their anions.

In the IUPAC naming system, " aqueous " is simply added to the name of the ionic compound.

Classical naming system:

In 1754 Carl von Linné ( Carl Linnaeus ) divided the plant Kingdom into 25 classes in a taxonomy with a standardized binomial naming system for animal and plant species.

Generally it refers to a system for naming chemical compounds.

Before that, ancestors had used the patronymic naming system of Scandinavian countries: his father was named Ingemarsson after his father Ingemar Bengtsson.

In Swedish, Danish, Norwegian and Finnish, besides the ordinal naming of centuries another system is often used based on the hundreds part of the year, and consequently centuries start at even multiples of 100.

The steps for naming molecules using the CIP system are often presented as:

Berthollet, along with Antoine Lavoisier and others, devised a chemical nomenclature, or a system of names, which serves as the basis of the modern system of naming chemical compounds.

The Domain Name System ( DNS ) is a hierarchical distributed naming system for computers, services, or any resource connected to the Internet or a private network.

They note that the discoverers of the two planets around HW Virginis tried to circumvent the naming problem by calling them " HW Vir 3 " and " HW Vir 4 ", i. e. the latter is the 4th object – stellar or planetary – discovered in the system.

( This was inspired by an old system for naming moons of the outer planets, such as " Jupiter IV " for Callisto.

In the GNU / Linux naming controversy the FSF argues for the term GNU / Linux because GNU was a longstanding project to develop a free operating system, of which they say the kernel was the last missing piece.

Although there are some notable exceptions, most product names are based on a special naming system developed by IKEA.

This committee was the first international conference to create an international naming system for organic compounds.

IBM and users almost unanimously called the new system MVS from the start, and IBM continued to use the term MVS in the naming of later major versions such as MVS / XA.

The G-series naming system was created by the United States when it uncovered the German activities, labeling tabun as GA ( German Agent A ), sarin as GB and soman as GD.

As this sub-topic is generally broad and complex — at high levels of play it is routine for ten or more moves to be rattled off from rote memorization by both players, travelling down well-worn paths, and there is a common naming system for diverse early-game move choices — it is probably best to leave expansion of this topic to a separate article specifically dedicated to the issue or to say no more.

With the generalization of the definition, this naming system is no longer strictly adhered to.

The major problem with Bayer's naming system was the number of letters in the Greek alphabet ( 24 ).

His works implemented a standardized binomial naming system for animal and plant species, which proved to be an elegant solution to a chaotic and disorganized taxonomic literature.

The current naming system is:

ULC ministers are authorized by the church to officiate weddings and funerals, perform baptisms or verbal baby naming ceremonies, hold services ( also called meetings ), and other sacraments and rites regularly performed by ordained members of clergy and part of the particular belief system the minister represents.