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Topic: Astronomical-Unit

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Astronomical unit - Wikipedia, the free encyclopedia While the value of the astronomical unit is now known to great precision, the value of the mass of the Sun is not, because of uncertainty in the value of the gravitational constant. Solar Mass Loss, the Astronomical Unit, and the Scale of the Solar System (a discussion of the relation between the AU and other quantities) For greater precision, the International Astronomical Union in 1976 defined the AU as the distance from the Sun at which a particle of negligible mass, in an unperturbed circular orbit, would have an orbital period of 365.256 898 3 days (a Gaussian year). en.wikipedia.org /wiki/Astronomical_unit   (977 words)

Astronomical distance - Wikipedia, the free encyclopedia Another often used unit, on the same order of magnitude as the light year is the parsec. The distance to an astronomical body is often, therefore, referred to by the time it takes light to reach the body. Distance measurements began with astronomers of the renaissance using parallax across the face of the earth to determine the distance to nearby heavenly bodies. en.wikipedia.org /wiki/Astronomical_distance   (449 words)

Astronomical constant - Wikipedia, the free encyclopedia The astronomical constants may also be taken to include such physical constants as the speed of light (c), the gravitational constant (G), and the Planck constant (h). An astronomical constant is a physical constant used in astronomy. The values of the astronomical constants have been recalculated at various times, perhaps most notably by the Canadian-born astronomer Simon Newcomb (1835–1909). en.wikipedia.org /wiki/Astronomical_constant   (104 words)

astronomical unit concept from the Astronomy knowledge base The astronomical unit is defined as the length of the radius of the unperturbed circular orbit of a body of negligible mass moving around the Sun with a sidereal angular velocity of 0.017202098950 radian per day of 86400 ephemeris seconds. astronomical unit concept from the Astronomy knowledge base abstraction > mathematical concept > unit > length unit > astronomical unit www.site.uottawa.ca:4321 /astronomy/astronomicalunit.html   (219 words)

Definitions of the SI units: Non-SI units The astronomical unit is a unit of length. Units outside the SI Certain units are not part of the International System of Units, that is, they are outside the SI, but are important and widely used. These units, which are subject to future review, should be defined in relation to the SI in every document in which they are used; their continued use is not encouraged. physics.nist.gov /cuu/Units/outside.html   (466 words)

The Astronomical Unit (AU): Mercury/Sun Distance The astronomical unit (AU) currently in use is derived from the average mean distance between the Earth and the Sun, which is generally cited as 93,000,000 miles or 1,496,000,000 kilometers. It does not seem at all acceptable to employ the Earth/Sun distance for the astronomical unit of measurement, given the fact that it lies somewhere within the system, not as one of the system's defining or manifest parameters, by itself determined by those parameters. Furthermore, one immediately recognizes the advantage a unit of measurement for the astronomical unit as that of the distance Mercury/Sun, given the fact that the 36c coincides with the ancient reckoning day-count (360c). www.earthmatrix.com /orbital/astronomical_unit.html   (1297 words)

Astronomical unit (Henry Spencer) From: Henry Spencer Newsgroups: sci.space.science Subject: Re: Astronomical Units Date: Tue, 24 Mar 1998 05:31:13 GMT In article <6f1ud3$7rj@lace.colorado.edu>, Frank Crary wrote: >...If you mean using the distance between the Earth and the Sun as a unit >of length, then the use is ancient... Almost certainly "astronomical unit" is an English translation of whatever term he used. In particular, he originated the idea of putting together a complete system of units -- for calculations, not just results -- with the AU as the unit of length, the day as the unit of time, and the Sun's mass as the unit of mass, with constants (notably the constant of gravity) adjusted to match. yarchive.net /space/science/astronomical_unit.html   (399 words)

The Nine Planets Glossary English astronomer and mathematician who, at the age of 24, was the first person to predict the position of a planetary mass beyond Uranus. One of the earliest American astronomers of note; rose from poverty and overcame a lack of formal education to become the first director of the Harvard College Observatory where he studied Saturn and (with Lassell) discovered its moon Hyperion. English astronomer who applied Newton's laws of motion to historical comet data and predicted correctly the reappearance of the comet which now bears his name. seds.lpl.arizona.edu /nineplanets/nineplanets/help.html   (4842 words)

astronomical unit The astronomical unit of time is the day, defined as 86,400 seconds (the second as defined in SI), and the astronomical unit of mass is the mass of the sun, by definition 1. that 1) dimensions of celestial bodies, velocities, etc. be described in kilometers, 2) "la distance moyenne du soleil à la terre, ou unité astronomique" [the average distance between the sun and earth, or astronomical unit] be used for distances in the solar system and 3) the parsec be used for distances to stars. In 1976 the 16th General Assembly of the International Astronomical Union defined the astronomical unit of length (as part of the International System of Astronomical Constants) as “that length for which the Gaussian gravitational constant (k) takes the value 0. www.sizes.com /units/astronomical_unit.htm   (346 words)

astronomical unit on Encyclopedia.com The astronomical unit is the principal unit of measurement within the solar system, e.g., Mercury is just over 1/3 AU and Pluto is about 39 AU from the sun. ASTRONOMICAL UNIT [astronomical unit] (AU), mean distance between the earth and sun; one AU is c.92,960,000 mi (149,604,970 km). Astronomical ambitions: frustrated by the high cost of modern astronomy, a group of Liverpool academics decided to build their own telescopes. www.encyclopedia.com /html/a1/astronomU1.asp   (334 words)

w8ragland.html Mars is one and one half astronomical units from the sun and Jupiter is five and one fourth. By using a yard (36 inches) for our unit of measure that represents one astronomical unit, the students will be able to see the planets on the football field and get an idea of their distances from the sun in relevance of the earth's distance. By using a unit of measure to represent an astronomical unit, the students should be able to show on paper or outside how far each planet is away from the sun. www.southwestern.edu /~kamenm/auburn/w8ragland.html   (1616 words)

astronomical unit --  Encyclopædia Britannica Astronomical distances are so huge that astronomers often use the light-year as the unit of distance. Provides information on its mission, functions, observatory, associated units, and telescope. Resource for educational projects and programs related to astronomical sciences sponsored by NASA and the University of California Berkeley Space Sciences Laboratory. www.britannica.com /eb/article-9010001   (919 words)

astronomical unit Unit equal to the mean distance of the Earth from the Sun&; 149.6 million km/92.96 million mi. www.tiscali.co.uk /reference/encyclopaedia/hutchinson/m0005743.html   (204 words)

Parallax The average distance between the Earth and the Sun is a natural distance unit and is called an Astronomical Unit (AU). Magnitude is a historical unit of stellar brightness and is defined such that a change of 5 magnitudes represents a factor of 100 in intensity. AU An often preferrable large distance unit is the parsec (pc), the distance at which one AU would subtend a second of arc: hyperphysics.phy-astr.gsu.edu /hbase/astro/para.html   (437 words)

The MSDS HyperGlossary: Distance Unit Conversions An astronomical unit is defined as the mean distance between the Earth and the Sun. A unit of distance that would be traversed in a period of one year by an object moving at the speed of light in a vacuum (300,000,000 meters per second). A unit of distance equal to the distance from the sun to a point having a heliocentric (sun-centered) parallax of one second (second as an angle, not a time unit). www.ilpi.com /msds/ref/distanceunits.html   (805 words)

astronomical unit. The American Heritage® Dictionary of the English Language: Fourth Edition. 2000. AU A unit of length used in measuring astronomical distances within the solar system equal to the mean distance from Earth to the sun, approximately 150 million kilometers (93 million miles). www.bartleby.com /61/77/A0487700.html   (95 words)

astronomical unit a unit of length, equal to the mean distance of the earth from the sun: approximately 93 million miles (150 million km). www.infoplease.com /dictionary/astronomical+unit   (39 words)

Units for Stellar Distances From basic trigonometry we find that this distance is equal to 206,265 astronomical units (where the astronomical unit is the average separation of the Earth and the Sun) or 3.26 light years. A light year is often a convenient unit in discussing distances between stars, because the average separation between stars in a galaxy is typically of that order of magnitude. Although the light year is often found in popular level discussions, professional astronomers probably use the parsec, kiloparsec, and megaparsec more commonly as units of large distance. csep10.phys.utk.edu /astr162/lect/distances/units.html   (531 words)

Astronomical units of measure Astronomical Unit (A.U.): average distance between Earth and the Sun. Parsec (pc): distance from which an observer would see the major semi-axis of the terrestrial orbit under the angle of 1''. www.astrofilitrentini.it /mat/dati/unita_e.html   (47 words)

Astronomical Unit Astronomical Unit has been performing for several years with Bill "Greezy Fingers" Smith on keyboards, alto sax and vocals; Dave "Super T" Tran on guitar, percussion and vocals; Andy "Dr. Gravymaster" Mandiak on bass; and Brian "Soup Kitchen" Platino on drums and percussion. Songs created by Astronomical Unit are a collaboration of each member’s varied eclectic tastes in music, which give each tune its own vibe, yet all have a similar focus: to shake booties whenever and wherever possible. The Unit is a group of four classically and jazz educated musicians who use their talents and abilities in the eternal pursuit of funkiness. www.astronomicalunit.com /bios.asp   (205 words)

Astronomical Unit The Astronomical Unit is the average distance between the Sun and Earth. Kepler's laws relate the period of a planet's orbit (in years) to the average distance of the planet to the Sun in (astronomical units). Thus a spacecraft in orbit around another planet has its distance known in both kilometers and astronomical units, and you can just divide one by the other to get the number of kilometers in an astronomical unit. imagine.gsfc.nasa.gov /docs/ask_astro/answers/980122b.html   (293 words)

BBC - h2g2 - Astronomical Units Simply stated, an astronomical unit is the mean distance between the Earth and the Sun. The Astronomical Unit (AU) is what is known as a Natural Unit. In these times everything was measured with relative units (ie Mars is 1.5 times farther from the Sun than the Earth is) and later, when absolute measurements were deciphered, no one wanted to give up this unit. www.bbc.co.uk /h2g2/guide/A201790   (207 words)

The Astronomical Distance Scale Radar+ Newton's laws determine the AU (Astronomical Unit = 149,597,900km ~ 93,000,000 miles). It is interesting to note that the units for the Hubble Parameter are 1/time and the current estimate corresponds to a time of about 15 billion years. From the work of Slipher in the early part of the 1900's astronomers knew that most of the spiral nebulae (galaxies) are receding from us. cassfos02.ucsd.edu /public/tutorial/Distances.html   (919 words)

<VENUS2004.ORG> File : Measuring the astronomical unit, observation methodologies To avoid confusions the calculations will be explained in another file called « Calculations of the Astronomical unit using the data from the observation ». This file which concerns only practical aspects of the observations will inform you about the two methodologies allowing you to get the data needed to calculate the astronomical unit (A.U.). File : Measuring the astronomical unit, observation methodologies www.venus2004.org /comprendre/d/dossier388-1.php?langue=2   (171 words)

Solar Mass Loss, the Astronomical Unit, and the Scale of the Solar System The new definition would have to be: "The Astronomical Unit is defined as the radius of a circular orbit, in which a body of negligible mass, and free of perturbations, would revolve around a body whose mass is one solar mass unit in 2 To compare with experiment, the numbers of immediate interest are the variations of the semi-major axes of planetary orbits as compared with the estimated error in the AU, as well as secular corrections to the mean motion, namely changes in the period and mean anomaly. When multiplied by the present orbital semi-major axes of the planets Mercury, Venus, Earth and Mars, and the number of orbits in a century, Eq.(18) yields displacements along the orbit in one century of -1380 m, -1009 m, -858 m, and -695 m, respectively. home.comcast.net /~pdnoerd/SMassLoss.html   (3128 words)

Define astronomical unit - a Whatis.com definition - see also: AU An astronomical unit (AU) is the mean distance between the center of the Earth and the center of the sun. Define astronomical unit - a Whatis.com definition - see also: AU Search our IT-specific encyclopedia for: Also see the Table of Physical Units and Constants. whatis.techtarget.com /definition/0,,sid9_gci849638,00.html   (237 words)

The Scale of the Solar System If the mean distance of Earth from the Sun is 1 AU ("Astronomical Unit"), then that of Venus is 0.723 AU, of Mercury 0.387 AU and that of Mars is 1.524 AU. One of the goals of the famous expedition by Captain James Cook to the Pacific Ocean was to observe the transit from a point far from other observers. Soon afterwards the telescope was discovered, and starting with Galileo, astronomers realized that Venus appeared as a round disk (or a crescent, when near Earth and presenting mostly its dark side). www-istp.gsfc.nasa.gov /stargaze/Sscale.htm   (838 words)

What is the Astronomical Unit? The Astronomical Unit (AU) represents a distance of Earth's average distance to the Sun, or about 93,000,000 miles. When describing distances on the scale of our Solar System, conventional units of measure are not conveniently sized. Comparing those two numbers, it is not easily seen that Pluto is about 40 times as far from the Sun as Earth is. www.physlink.com /Education/AskExperts/ae238.cfm   (189 words)

The LIX Unit The Astronomical Unit (A.U.), the mean distance of the Earth from the Sun is the basis Conversely, dividing the Golden Section by 33 produces the Astronomical Unit. The following is one result of applying the LIX unit to a known measured structure, www.klatu.com /lix   (1802 words)

Astronomical unit · Astrological definition of Astronomical unit · Astrology Encyclopedia Astronomical unit · Astrological definition of Astronomical unit · Astrology Encyclopedia · April 8, 2006, 22:30 GMT Astronomical unit · Astrological definition of Astronomical unit · Astrology Encyclopedia Mean distance of Earth to Sun, or 92,900,000 miles; employed as a unit for indicating intra-solar system distances. www.astrologyweekly.com /dictionary/astronomical-unit.php   (546 words)

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