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A parsec (symbol: pc) is an astronomical unit of distance derived by the theoretical annual parallax (or heliocentric parallax) of one arc second, and is found as the inverse of that measured parallax. In astronomical terms, parallaxes are the apparent measured difference in the position of a star as seen from Earth and another hypothetical observer at the Sun. As the distance is the inverse of the parallax, the smaller the measured parallax the larger the celestial object's distance.
One parsec equals about 3.26 light-years (30.9 trillion kilometres or 19.2 trillion miles). All known stars lie more than one parsec away, with Proxima Centauri showing the largest parallax of 0.7687 arcsec, making the distance 1.3009 parsecs (4.243 light years).[1] Most of the visible stars in the nighttime sky lie within 500 parsecs of the Sun.
The parsec was introduced to make quick calculations of astronomical distances without the need for more complicated conversions, i.e. knowing the true speed of light to calculate light years. Parsec is named from the abbreviation of the parallax of one arcsecond, and was likely first suggested by British astronomer Herbert Hall Turner in 1913.[2]
Usage of parsecs is preferred in astronomy and astrophysics, though popular science texts commonly use light-years, probably because it is much easier to understand the amount of time it takes light to travel from the source. Multiples of parsecs are commonly used for scales in the universe, including parsecs for the visible stars, kiloparsecs for galactic objects and megaparsecs for nearby and more distant galaxies.
History and derivation
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The parsec is equal to the length of the adjacent side of an imaginary right triangle in space. The two dimensions on which this triangle is based are the subtended angle of 1 arcsecond, and the opposite side that is defined as 1 astronomical unit, being the average Earth-Sun distance. From both values, along with the rules of trigonometry, the unit length of the adjacent side (the parsec) can be derived.
One of the oldest methods for astronomers to calculate the distance to a star was to record the difference in angle between two measurements of the position of the star in the sky. The first measurement was taken from the Earth on one side of the Sun, and the second was taken half a year later when the Earth was on the opposite side of the Sun. The distance between the two positions of the Earth when the two measurements were taken was known to be twice the distance between the Earth and the Sun. The difference in angle between the two measurements was known to be twice the parallax angle, which is formed by lines from the Sun and Earth to the star at the vertex. Then the distance to the star could be calculated using trigonometry.[3] The first successful direct measurements of an object at interstellar distances were undertaken by German astronomer Friedrich Wilhelm Bessel in 1838, who used this approach to calculate the three and a half parsec distance of 61 Cygni.[4]
The parallax of a star is taken to be half of the angular distance that a star appears to move relative to the celestial sphere as Earth orbits the Sun. Equivalently, it is the subtended angle, from that star's perspective, of the semi-major axis of Earth's orbit. The star, the Sun and the Earth form the corners of an imaginary right triangle in space: the right angle is the corner at the Sun, and the corner at the star is the parallax angle. The length of the opposite side to the parallax angle is the distance from the Earth to the Sun (defined as 1 astronomical unit (AU)), and the length of the adjacent side gives the distance from the sun to the star. Therefore, given a measurement of the parallax angle, along with the rules of trigonometry, the distance from the Sun to the star can be found. A parsec is defined as the length of the adjacent side of this right triangle in space when the parallax angle is 1 arcsecond.
The use of the parsec as a unit of distance follows naturally from Bessel's method, since distance in parsecs can be computed simply as the reciprocal of the parallax angle in arcseconds (i. e., if the parallax angle is 1 arcsecond, the object is 1 pc from the Sun; If the parallax angle is 0.5 arcsecond, the object is 2 pc away; etc.). No trigonometric functions are required in this relationship because the very small angles involved mean that the approximate solution of the skinny triangle can be applied.
Though it may have been used before, the term parsec was first mentioned in an astronomical publication in 1913. Astronomer Royal Frank Watson Dyson expressed his concern for the need of a name for that unit of distance. He proposed the name astron, but mentioned that Carl Charlier had suggested siriometer and Herbert Hall Turner had proposed parsec.[5] It was Turner's proposal that stuck.
Calculating the value of a parsec
In the diagram above (not to scale), S represents the Sun, and E the Earth at one point in its orbit. Thus the distance ES is one astronomical unit (AU). The angle SDE is one arcsecond (Template:Frac of a degree) so by definition D is a point in space at a distance of one parsec from the Sun. By trigonometry, the distance SD is
Using the small-angle approximation, by which the sine (and, hence, the tangent) of an extremely small angle is essentially equal to the angle itself (in radians),
Since the astronomical unit is defined to be Template:Gaps metres,[6] the following can be calculated.
1 parsec ≈ Template:Val astronomical units ≈ Template:Val metres ≈ Template:Val trillion miles ≈ Template:Val light years
A corollary is that 1 parsec is also the distance from which a disc with a diameter of 1 AU must be viewed for it to have an angular diameter of 1 arcsecond (by placing the observer at D and a diameter of the disc on ES).
Usage and measurement
The parallax method is the fundamental calibration step for distance determination in astrophysics; however, the accuracy of ground-based telescope measurements of parallax angle is limited to about 0.01 arcsecond, and thus to stars no more than 100 pc distant.[7] This is because the Earth’s atmosphere limits the sharpness of a star's image.[8] Space-based telescopes are not limited by this effect and can accurately measure distances to objects beyond the limit of ground-based observations. Between 1989 and 1993, the Hipparcos satellite, launched by the European Space Agency (ESA), measured parallaxes for about Template:Val stars with an astrometric precision of about 0.97 milliarcsecond, and obtained accurate measurements for stellar distances of stars up to Template:Val pc away.[9][10]
Template:As of, ESA's Gaia satellite, which is scheduled to launch in December 2013, is intended to measure one billion stellar distances to within 20 microarcseconds, producing errors of 10% in measurements as far as the Galactic Center, about Template:Val away in the constellation of Sagittarius.[11]
Distances in parsecs
Distances less than a parsec
Distances expressed in fractions of a parsec usually involve objects within a single star system. So, for example:
- One astronomical unit (au), the distance from the Sun to the Earth, is just under Template:Val parsecs.
- The most distant space probe, Voyager 1, was 0.0006 parsec (0.002 light-years) from Earth Template:As of. It took Voyager Template:Age years to cover that distance.
- The Oort cloud is estimated to be approximately 0.6 parsec (2.0 light-years) in diameter
Parsecs and kiloparsecs
Distances expressed in parsecs (pc) include distances between nearby stars, such as those in the same spiral arm or globular cluster. A distance of Template:Val parsecs (Template:Val light-years) is commonly denoted by the kiloparsec (kpc). Astronomers typically use kiloparsecs to express distances between parts of a galaxy, or within groups of galaxies. So, for example:
- One parsec is approximately 3.26 light-years.
- The nearest known star to the Earth, other than the Sun, Proxima Centauri, is 1.30 parsecs (4.24 light-years) away, by direct parallax measurement.
- The distance to the open cluster Pleiades is 130 ± 10 pc (420 ± 32.6 light-years) from us, per Hipparcos parallax measurement.
- The center of the Milky Way is more than 8 kiloparsecs (Template:Val) from the Earth, and the Milky Way is roughly 34 kpc (Template:Val) across.
- The Andromeda Galaxy (M31) is ~780 kpc (~2.5 million light-years) away from the Earth.
Megaparsecs and gigaparsecs
A distance of one million parsecs (3.26 million light-years or 3.26 "Mly") is commonly denoted by the megaparsec (Mpc). Astronomers typically express the distances between neighbouring galaxies and galaxy clusters in megaparsecs.
Galactic distances are sometimes given in units of Mpc/h (as in "50/h Mpc"). h is a parameter in the range [0.5,0.75] reflecting the uncertainty in the value of the Hubble constant H for the rate of expansion of the universe: h = H / (100 km/s/Mpc). The Hubble constant becomes relevant when converting an observed redshift z into a distance d using the formula d ≈ (c / H) × z.[12]
One gigaparsec (Gpc) is one billion parsecs — one of the largest units of length commonly used. One gigaparsec is about 3.26 billion light-years (3.26 "Gly"), or roughly one fourteenth of the distance to the horizon of the observable universe (dictated by the cosmic background radiation). Astronomers typically use gigaparsecs to express the sizes of large-scale structures such as the size of, and distance to, the CfA2 Great Wall; the distances between galaxy clusters; and the distance to quasars.
For example:
- The Andromeda Galaxy is about 0.78 Mpc (2.5 million light-years) from the Earth.
- The nearest large galaxy cluster, the Virgo Cluster, is about 16.5 Mpc (54 million light-years) from the Earth.[13]
- The galaxy RXJ1242-11, observed to have a supermassive black hole core similar to the Milky Way's, is about 200 Mpc (650 million light-years) from the Earth.
- The particle horizon (the boundary of the observable universe) has a radius of about 14.0 Gpc (46 billion light-years).[14]
Volume units
To determine the number of stars in the Milky Way Galaxy, volumes in cubic kiloparsecsTemplate:Efn (kpc3) are selected in various directions. All the stars in these volumes are counted and the total number of stars statistically determined. The number of globular clusters, dust clouds, and interstellar gas is determined in a similar fashion. To determine the number of galaxies in superclusters, volumes in cubic megaparsecsTemplate:Efn (Mpc3) are selected. All the galaxies in these volumes are classified and tallied. The total number of galaxies can then be determined statistically. The huge void in Boötes[15] is measured in cubic megaparsecs.
In cosmology, volumes of cubic gigaparsecsTemplate:Efn (Gpc3) are selected to determine the distribution of matter in the visible universe and to determine the number of galaxies and quasars. The Sun is alone in its cubic parsec,Template:Efn (pc3) but in globular clusters the stellar density per cubic parsec could be from 100 to Template:Val.
References
Explanatory notes Template:Notes
Citations 43 year old Petroleum Engineer Harry from Deep River, usually spends time with hobbies and interests like renting movies, property developers in singapore new condominium and vehicle racing. Constantly enjoys going to destinations like Camino Real de Tierra Adentro.
External links
Template:New Testament manuscript infobox
Codex Augiensis, designated by Fp or 010 (in the Gregory-Aland numbering), α 1029 (von Soden) is a 9th-century diglot uncial manuscript of the Pauline Epistles in double parallel columns of Greek and Latin on the same page.[16]
Description
The codex contains 136 parchment leaves (Template:×), with some gaps in the Greek (Romans 1:1-3:19, 1 Corinthians 3:8-16, 6:7-14, Colossans 2:1-8, Philemon 21-25, Hebrews). Hebrews is given in Latin only.[17] It is written in two columns per page, 28 lines per page.[16]
Text
Textual character
The Greek text of this codex is a representative of the Western text-type. According to Kurt and Barbara Aland it agrees with the Byzantine standard text 43 times, and 11 times with the Byzantine when it has the same reading as the original text. It agrees 89 times with the original text against the Byzantine. It has 70 independent or distinctive readings. Alands placed it in Category II.[16]
Textual features
In Romans 12:11 it reads καιρω for κυριω, the reading of the manuscript is supported by Codex Claromontanus*, Codex Boernerianus 5 it d,g, Origenlat.[18]
In 1 Corinthians 2:4 the Latin text supports reading πειθοι σοφιας (plausible wisdom), as 35 and Codex Boernerianus (Latin text).[19]
In 1 Corinthians 7:5 it reads τη προσευχη (prayer) along with 11, 46, א*, A, B, C, D, G, P, Ψ, 6, 33, 81, 104, 181, 629, 630, 1739, 1877, 1881, 1962, it vg, cop, arm, eth. Other manuscripts read τη νηστεια και τη προσευχη (fasting and prayer) or τη προσευχη και νηστεια (prayer and fasting) – 330, 451, John of Damascus.[20][21]
The section 1 Cor 14:34-35 is placed after 1 Cor 14:40, like other manuscripts of the Western text-type (Claromontanus, Boernerianus, 88, itd, g, and some manuscripts of Vulgate).[22][23]
Relationship to Codex Boernerianus
The Greek text of both manuscripts is almost the same; the Latin text differs. Also lacunae omissions are paralleled to the sister manuscript Codex Boernerianus. According to Griesbach Augiensis was recopied from Boernerianus. According to Tischendorf two codices were recopied from the same manuscript. Scrivener enumerated 1982 differences between these two codices. Among textual scholars, there is a tendency to prefer Augiensis above Boernerianus. The codex is also similar to Codex Claromontanus, and again scholars favour the readings in Augiensis above those in Claromontanus.
History
Codex Augiensis is named after the monastery of Augia Dives in Lake Constance.[24] In 1718 Richard Bentley (1662–1742) was its owner. The Greek text of the codex was edited by Scrivener in 1859.[17] It was examined, described and collated by Tischendorf.[25] E. M. Thompson edited a facsimile.[26]
The codex today is located in the library of Trinity College (Cat. number: B. XVII. 1) in Cambridge.[16][27]
See also
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References
43 year old Petroleum Engineer Harry from Deep River, usually spends time with hobbies and interests like renting movies, property developers in singapore new condominium and vehicle racing. Constantly enjoys going to destinations like Camino Real de Tierra Adentro.
Further reading
- F. H. A. Scrivener, Contributions to the Criticism of the Greek New Testament bring the introduction to an edition of the Codex Augiensis and fifty other Manuscripts, Cambridge 1859.
- K. Tischendorf, Anecdota sacra et profana ex oriente et occidente allata sive notitia, Lipsiae 1861, pp. 209-216.
- W. H. P. Hatch, On the Relationship of Codex Augiensis and Codex Boernerianus of the Pauline Epistles, Harvard Studies in Classical Philology, Vol. 60, 1951, pp. 187–199.
External links
- R. Waltz, Codex Augiensis F (010), Encyclopedia of Textual Criticism
- Codex Augiensis at the Trinity College Library Cambridge
- Cambridge Trinity B.17.1 high-resolution digital reproduction available at the St Gall Plan Project.
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You can view that web-site... ccleaner free download - ↑ Dyson, F. W., Stars, Distribution and drift of, The distribution in space of the stars in Carrington's Circumpolar Catalogue. In: Monthly Notices of the Royal Astronomical Society, Vol. 73, p. 334–342. March 1913. [1]
"There is a need for a name for this unit of distance. Mr. Charlier has suggested Siriometer ... Professor Turner suggests PARSEC, which may be taken as an abbreviated form of 'a distance corresponding to a parallax of one second.'" - ↑ Template:Cite web
- ↑ Bessel, FW, "Bestimmung der Entfernung des 61sten Sterns des Schwans" (1838) Astronomische Nachrichten, vol. 16, pp. 65–96.
- ↑ Dyson, F. W., "The distribution in space of the stars in Carrington's Circumpolar Catalogue" (1913) Monthly Notices of the Royal Astronomical Society, vol. 73, pp. 334–42, p. 342 fn..
- ↑ Many property agents need to declare for the PIC grant in Singapore. However, not all of them know find out how to do the correct process for getting this PIC scheme from the IRAS. There are a number of steps that you need to do before your software can be approved.
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To achieve the very best outcomes, you must be always updated on market situations, including past transaction information and reliable projections. You could review and examine comparable homes that are currently available in the market, especially these which have been sold or not bought up to now six months. You'll be able to see a pattern of such report by clicking here It's essential to defend yourself in opposition to unscrupulous patrons. They are often very skilled in using highly unethical and manipulative techniques to try and lure you into a lure. That you must also protect your self, your loved ones, and personal belongings as you'll be serving many strangers in your home. Sign a listing itemizing of all of the objects provided by the proprietor, together with their situation. HSR Prime Recruiter 2010 - ↑ Richard Pogge, Astronomy 162, Ohio State.
- ↑ jrank.org, Parallax Measurements
- ↑ Template:Cite web
- ↑ Catherine Turon, From Hipparchus to Hipparcos
- ↑ GAIA from ESA.
- ↑ Template:Cite web
- ↑ Mei, S. et al 2007, ApJ, 655, 144
- ↑ Template:Cite web
- ↑ Astrophysical Journal, Harvard
- ↑ 16.0 16.1 16.2 16.3 20 year-old Real Estate Agent Rusty from Saint-Paul, has hobbies and interests which includes monopoly, property developers in singapore and poker. Will soon undertake a contiki trip that may include going to the Lower Valley of the Omo.
My blog: http://www.primaboinca.com/view_profile.php?userid=5889534 - ↑ 17.0 17.1 20 year-old Real Estate Agent Rusty from Saint-Paul, has hobbies and interests which includes monopoly, property developers in singapore and poker. Will soon undertake a contiki trip that may include going to the Lower Valley of the Omo.
My blog: http://www.primaboinca.com/view_profile.php?userid=5889534 - ↑ UBS3, p. 564.
- ↑ UBS3, p. 581.
- ↑ NA26, p. 450.
- ↑ UBS3, p. 591.
- ↑ NA26, p. 466.
- ↑ Bruce M. Metzger, A Textual Commentary on the Greek New Testament (Deutsche Bibelgesellschaft: Stuttgart, 2001), pp. 499-500.
- ↑ 20 year-old Real Estate Agent Rusty from Saint-Paul, has hobbies and interests which includes monopoly, property developers in singapore and poker. Will soon undertake a contiki trip that may include going to the Lower Valley of the Omo.
My blog: http://www.primaboinca.com/view_profile.php?userid=5889534 - ↑ K. Tischendorf, Anecdota sacra et profana ex oriente et occidente allata sive notitia, Lipsiae 1861, pp. 209-216.
- ↑ Facsimiles of Manuscripts and Inscriptions, ed. E. A. Bond, E. M. Thompson and others I (London, 1873-1883), 127.
- ↑ Template:Cite web