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Topic: Astronomical transit


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  Transit of Venus - Wikipedia, the free encyclopedia   (Site not responding. Last check: 2007-10-22)
Transits of Venus are rare and currently occur in a pattern that repeats every 243 years, with pairs of transits 8 years apart separated by long gaps of 121.5 years and 105.5 years.
Although by the 17th century astronomers could calculate each planet's relative distance from the Sun in terms of the distance of the Earth from the Sun (an astronomical unit), the absolute value (in miles or kilometers) of this distance was not known very precisely.
Transit of Venus is the title of a play by Maureen Hunter, a fictionalisation of the efforts of Guillaume Le Gentil to observe the Transit of Venus in different parts of the globe.
www.hartselle.us /project/wikipedia/index.php/Transit_of_Venus   (1922 words)

  
 Knowledge King - Astronomical transit   (Site not responding. Last check: 2007-10-22)
A transit is the astronomical event that occurs when a non-luminous body subtending a smaller angular diameter passes between an observer and another body which, though more distant, subtends a larger angular diameter.
To a pedant, an annular eclipse is a transit of the Moon.
In the 18th century, the transit pair of 1761 and 1769 was used to determine the value of the astronomical unit.
www.knowledgeking.net /encyclopedia/a/as/astronomical_transit.html   (218 words)

  
 Transit of Mercury - Wikipedia, the free encyclopedia   (Site not responding. Last check: 2007-10-22)
Transits of Mercury with respect to Earth are much more frequent than transits of Venus, with about 13 or 14 per century, in part because Mercury is closer to the Sun and orbits it faster.
During a May transit, Mercury is near aphelion and has an angular diameter of 12"; during a November transit, it is near perihelion and has an angular diameter of 10".
The transit of November 15 1999 was such a transit, and the previous one before that was on October 28 743.
www.bucyrus.us /project/wikipedia/index.php/Transit_of_Mercury   (539 words)

  
 Astronomical transit -- Facts, Info, and Encyclopedia article   (Site not responding. Last check: 2007-10-22)
A transit is the (Click link for more info and facts about astronomical) astronomical event that occurs when one (Natural objects visible in the sky) celestial body appears to move across the face of another celestial body, as seen by an observer at some particular vantage point.
A transit of Mars across Jupiter on 12 Sep 1170 was observed by the monk Gervase at (A town in Kent in southeastern England; site of the cathedral where Thomas a Becket was martyred in 1170; seat of the archbishop and primate of the Anglican Church) Canterbury, and by Chinese astronomers.
During a transit there are four "contacts", when the (The length of the closed curve of a circle) circumference of the small circle (small body disk) touches the circumference of the large circle (large body disk) at a single point.
www.absoluteastronomy.com /encyclopedia/A/As/Astronomical_transit.htm   (1040 words)

  
 Astronomical transit: Definition and Links by Encyclopedian.com - All about Astronomical transit
A transit, of a planet, is when the planet moves between an observing planet (such as Terra) and the solar system's star; such that, the planet appears to move across the Sun's disk.
Transits of Venus, with respect to Terra, are rare, they currently happen in pairs, 8 years apart which repeat only after more than a century.
Transits of Mercury, with respect to Terra, being closer to the Sun, are more frequent, about thirteen per century.
www.encyclopedian.com /as/Astronomical-transit.html   (181 words)

  
 Encyclopedia: Astronomical transit   (Site not responding. Last check: 2007-10-22)
A transit of Deimos from Mars: Deimos is in transit across the Sun, as seen from Mars by Mars Rover Opportunity on March 4, 2004 at 03:03:43 UTC Earth time.
In this speech an annular solar eclipse is a transit of the moon before the sun, while a total solar eclipse is an occultation of the sun by the moon.
The Transit of Vulcan, a supposed passage of an unknown object before the sun, observed in the 18th and 19th centuries, believed to be of volcanic origin.
www.nationmaster.com /encyclopedia/Astronomical-transit   (4003 words)

  
 NASA - Planetary Transits Page
The transit or passage of a planet across the disk of the Sun may be thought of as a special kind of eclipse.
To determine whether a transit of Mercury is visible from a specific geographic location, it is simply a matter of calculating the Sun's altitude and azimuth during each phase of the transit using information tabulated in the Seven Century Catalog of Mercury Transit.
To determine whether a transit of Venus is visible from a specific geographic location, it is simply a matter of calculating the Sun's altitude and azimuth during each phase of the transit using information tabulated in the Six Millennium Catalog of Venus Transits.
sunearth.gsfc.nasa.gov /eclipse/transit/transit.html   (1340 words)

  
 Rise, Set, and Twilight Definitions   (Site not responding. Last check: 2007-10-22)
Transit: The transit time of a celestial body refers to the instant that its center crosses an imaginary line in the sky - the observer's meridian - running from north to south.
Astronomical twilight is defined to begin in the morning, and to end in the evening when the center of the Sun is geometrically 18 degrees below the horizon.
Before the beginning of astronomical twilight in the morning and after the end of astronomical twilight in the evening the Sun does not contribute to sky illumination; for a considerable interval after the beginning of morning twilight and before the end of evening twilight, sky illumination is so faint that it is practically imperceptible.
aa.usno.navy.mil /faq/docs/RST_defs.html   (1486 words)

  
 Directory - Science: Astronomy: Eclipses, Occultations and Transits: Transits
Transit of Venus, 2004  · A table showing predicted time and path of the transit for various locations throughout the world.
Venus Transit 2004  · Describes the VT-2004 project that is related to this celestial event and which aims at transforming curiosity into knowledge and interest in science through a broad set of actions.
Venus Transit 2004  · The European Southern Observatory describes and invites participation in a project to reenact the determination of the solar parallax using a transit of Venus.
www.incywincy.com /default?p=932433   (425 words)

  
 [No title]
Airy, G.B. Lecture by the Astronomer Royal on the large telescopes of the Earl of Rosse and Mr.
The Astronomical Observer, a hand-book to the observatory and the common telescope.
Astronomical Observatories in Provence, the Southern Alps, and the Cote d'Azur.
www.europa.com /~telscope/telebibl.txt   (11838 words)

  
 Astronomical transit - Wikipedia, the free encyclopedia
There are only 18 mutual planetary transits and occultations as seen from Earth between 1700 and 2200.
A simulation of Venus transiting Jupiter, as it did on January 3, 1818.
For transit of planets in front of others, see also occultation.
en.wikipedia.org /wiki/Astronomical_transit   (676 words)

  
 Transit - Wikipedia, the free encyclopedia
transit instrument, a specialized astronomical telescope for observing transits
Transit (satellite), a precursor to the GPS satellite navigation system
The Ford Transit, a van made by the Ford Motor Company.
en.wikipedia.org /wiki/Transit   (209 words)

  
 History of Astronomy at Carolina
He specifically urged the purchase of "an Astronomical Clock, a Transit Instrument, and an Astronomical Telescope." Transit instruments are primarily used to determine the longitude, latitude, and local time in a particular place.
It was protected from the weather by a slight structure of wood which was drawn forwards and backwards, on a railway in the plane of the Meridian by a windlass and rope.
The Astronomical clock was fastened to the eastern wall of this room." Charles Phillips, the son of James Phillips, also reported that Caldwell, Mitchell, and his father observed eclipses, comets, and other celestial phenomena; all records of these observations, unfortunately, have been lost.
www.physics.unc.edu /about/astro_history.php   (1359 words)

  
 Transit of Venus: A Rare Astronomical Event
Proctor was a prominent astronomer and prolific writer on the subject of astronomy.
Let's first explore what a transit is. Simply stated, an astronomical transit occurs when one celestial object, such as a planet or a moon, passes in front of another celestial object.
Astronomers were trying to determine the mean distance from the Earth to the Sun, known as the astronomical unit (AU).
www.theskyscrapers.org /contentmgr/showdetails.php/id/1013   (2828 words)

  
 Astronomical transit
A transit is the astronomical event that occurs when one celestial body appears to move across the face of another celestialbody, as seen by an observer at some particular vantage point.
One suchcase occurred on March 21, 1894 at around23:00 UTC, when Mercury transited the Sun asseen from Venus, and Mercury and Venus both simultaneously transited the Sun as seen from Saturn (see Transit of Mercury from Saturn and Transit of Venus from Saturn).
During a transit there are four "contacts", when the circumference of the small circle (small body disk) touches thecircumference of the large circle (large body disk) at a single point.
www.therfcc.org /astronomical-transit-35139.html   (557 words)

  
 The Transit of Venus - Chapter 4
He not only predicted this particular transit but also worked out that transits of Venus involve a cyclical period of approximately 120 years.
Horrock's place in astronomical history was secured when he managed to predict that a further transit of Venus would occur on 4th December 1639 (24th November 1639, Old Style), 8 years after the one predicted by Kepler and much earlier than the 120 year wait predicted by Kepler.
The Sun's diameter for the transit day was estimated to be 31'30" and the diameter of Venus was estimated to be 4.0% of this (i.e.
www.dsellers.demon.co.uk /venus/ven_ch4.htm   (877 words)

  
 Transit Of Venus Encyclopedia Article, Definition, History, Biography   (Site not responding. Last check: 2007-10-22)
The first observation of a transit of Venus was made by Jeremiah Horrocks from his home in Much Hoole, near Preston in England, on 4 December 1639 (November 24 under the Julian calendar then in use in England).
Another was the first voyage of Captain Cook to observe the 1769 transit from Tahiti, before sailing on to New Zealand and then Australia, where his was to be the first expedition to chart the eastern coastline in 1770.
The next will be in 3089, though it nearly happens in 2846/2854; in 2854, Venus will just miss the Sun as seen from the centre of the Earth, though a partial transit will be visible from some parts of the southern hemisphere.
www.variedtastes.com /encyclopedia/Transit_of_Venus   (2083 words)

  
 Astronomical transit   (Site not responding. Last check: 2007-10-22)
One example of a transit involves the motion of a planet beween a terrestrial observer and the Sun.
On November 22 2065 at about 10:20 UTC, Venus near superior conjunction (with an angular diameter of 10.6") will transit in front of Jupiter (with an angular diameter of 30.9"); however, this will take place only 8° west of the Sun, and will therefore not be visible.
All of these times are as seen by a hypothetical observer at the center of the Earth; parallax would cause actual observed times to vary by a few minutes.
www.sciencedaily.com /encyclopedia/astronomical_transit   (642 words)

  
 Astronomical transit - Encyclopedia, History and Biography
Cases where the nearer object appears larger and completely hides the more distant object are known as occultations.
During a transit there are four "contacts", when the circumference of the small circle (small body disk) touches the circumference of the large circle (large body disk) at a single point.
The article about Astronomical transit contains information related to Astronomical transit, Mutual planetary transits and occultations, Contacts, Transit visibility table and See also.
www.arikah.net /encyclopedia/Astronomical_transit   (654 words)

  
 Venus Transit 2004
Transits of Venus across the disk of the Sun are among the rarest of planetary alignments.
In earlier times, astronomers used transits of Mercury and Venus to get information about the dimensions of the solar system: the size of the Sun, the distance of Venus, and the distance between us and the Sun, which is called the astronomical unit (AU).
The first astronomers to use telescopes to observe the transit of Venus were Jeremiah Horrocks (1618-41) and William Crabtree (1610-44) in 1639.
www.xs4all.nl /~carlkop/venus/transit.html   (1846 words)

  
 Astronomical transit instruments (from telescope) --  Encyclopædia Britannica
Without the transit instrument's very accurate determination of stellar and planetary positions, the larger deep-space telescopes would not be able to find their desired celestial object.
More results on "Astronomical transit instruments (from telescope)" when you join.
astronomical instrument consisting of a radio receiver and an antenna system that is used to detect radio-frequency radiation emitted by extraterrestrial sources.
www.britannica.com /eb/article-44214   (923 words)

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