This lesson is optional. It presents one of two methods by which ancient Greek astronomers estimated the distance to the Moon. ... This lesson plan supplements: "How distant is the Moon?--2," section #8d: on disk Shipparc.htm , on the web . ... Terms: Solar eclipse (total and partial) (terms umbra and penumbra may be used by the teacher for total and partial shadow), baseline, parallax. ... The Earth-Sun distance and Earth-Moon distance vary due to the elliptical orbits of the Earth and the Moon. ...

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• How Distant is the Moon?--lesson plan #14
• Estimating the Moon's Distance

Hipparchus, who used an eclipse of the Moon to deduce the precession of the equinoxes ( here ), used a total eclipse of the Sun --probably in 129 BC--to estimate how far the Moon was. But he also derived the Moon's distance from a lunar eclipse--see here .) That eclipse was total at the Hellespont--the Dardanelles, part of the narrow strait that separates the European and Asian parts of Turkey--but only 4 / 5 of the Sun were covered in Alexandria of Egypt, further to the south. ...

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• Parallax
• The Moon's Distance--Another Way
• Distance to the Horizon

An Ancient Universe: How Astronomers Know the Vast Scale of Cosmic Time . ... Astronomers can also determine the speed a galaxy is moving by breaking up its light into its component colors, rainbow-fashion. ... This pattern is now called "the expanding universe", since the entire universe of galaxies seems to be moving away. ... The Ancient Universe - The Age of the Expanding Universe - The Age of the Oldest Stars - The Age of Light From Distant Galaxies - The Age of the Chemical Elements | ...

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• ASP: An Ancient Universe - The Age of Light from the Most Distant Galaxies
• ASP: Biography of a Star: Our Sun's Birth, Life, and Death
• ASP: A Taste of Real Astronomy ? The ESA/ESO Astronomy Exercises

... Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2009 January 4 . Breaking Distant Light . ... Explanation: In the distant universe, time appears to run slowly. ... Above , the light from distant galaxies has been broken up into its constituent colors ( spectra ), allowing astronomers to measure the redshift of known spectral lines . ... About APOD | ... A service of: ASD at NASA / GSFC . ...

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• APOD: 2007 August 27 - Huge Void Implicated in Distant Universe
• APOD: 2015 March 9 - Galaxy and Cluster Create Four Images of Distant Supernova
• APOD: 2002 March 19 - Breaking Distant Light

... After all we cannot send a probe to the star Altair to confirm that it is 17 light years away. ... The "Bessel determined that the star 61 Cygni was about ten light years away" Earth goes around the Sun in one year, so in six month it is in the opposite position in its orbit. ... In 1838 Bessel determined that the star 61 Cygni had a parallax of 0.314 arcseconds and therefore the star was about ten light years away (today the distance is more precisely measured to be 11.4 light years). ...

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• Most distant galaxy ever seen | Astronotes

... GOODS unites extremely deep observations from NASA's Great Observatories, Spitzer , Hubble , and Chandra , ESA's Herschel and XMM-Newton , and from the most powerful ground-based facilities, to survey the distant universe to the faintest flux limits across the electromagnetic spectrum. ... The space-based observations are complemented by ground-based imaging and spectroscopy, including extensive commitments of ESO and NOAO observing time. ... 2010-04-10: Deep VLA 1.4 GHz data for GOODS-North . ...

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• Gaps in the Cloud Cover? Comparing Extinction Measures in Spiral Disks
• HST and the Distant Universe
• Image and Spectrum Recovery

Proceedings of the Particle Physics and Early Universe Conference (PPEUC). For this paper: postscript PPEUC CMB index 1 Introduction.. ... Combining measurements of the thermal Sunyaev--Zel'dovich effect with X-ray data allows calculation of a direct, physical estimate of Hubble's Constant ( ) without the need for distance-ladder-type arguments. ... 1 Introduction . ... 3 Calculating Hubble's Constant . 4 Errors In Determination of . ... PPEUC Proceedings . Fri Jun 27 15:29:33 BST 1997 ...

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• A Calculation of derivatives
• The distant DRAGNs survey

... Transformers like yours are designed with bolt-on covers because the customer goes inside frequently and makes changes. ... I know Continental went inside multiple times because they were having problems with the rectifier assembly due to faulty solder joints when it was being built. ... We have to discuss these topics because the root cause of failure was moisture in the oil. ... The transformer oil was saturated with water and the entry points were the cover gaskets. ...

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• Rotang - IDL procedure for calculating the optimum rotation angle for ALFA
• Alfa_ang - IDL procedure for calculating the optimum rotation angle for ALFA
• Details of Rotang

. Album : asv-album :: Travels to distant places and countries :: 1997/08 Kyoto, Nara (Japan) :: 24/08 Nara . Up . << Prev . Slope of the hill is covered by large stone staircase. Deers everywhere. Next >> . Photo album generated by album tool from Marginal Hacks by David on Tue Jun 23 14:46:23 2015 .

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• Image: In the maiko company. Look at their faces covered with thick layer of
• Image: Imperial Palace park. At the distance you can see the mountain with a
• Image: Japanese mountains look wild, but in reality almost everything is

... The search for distant objects which can be both galaxies and quasars is one of the most important problems of observational astrphysics, because it allows one to determine cosmological parameters connected with the time of appearence and evolution of stellar systems, large scale structure of the Universe. ... Radio galaxies are important objects to be studied because they are sources of infrared-optical-ultraviolet continuum, emission lines and continual radio emission. ...

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... U. Amsterdam Explanation: The GRB distance scale controversy may have just ended with a flash . Gamma Ray Bursts (GRBs) are powerful explosions occurring in seemingly random positions on the sky. ... There they found a faint but variable optical source : a potential counterpart to the gamma-ray burst that was getting brighter. Most importantly, continued scrutiny showed that this optical transient had absorption lines with a redshift of about 0.8 - the distance scale of galaxies and quasars . ...

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• Астронет > Optical Transient Near GRB970508 Shows Distant Redshift
• XWare > APOD

Blackholes2 Forum Message . ... Distant Galaxy Red Shift Caused By Time Passage Variation. ... If I were falling toward a neutron star or a black hole, a distant galaxy would seem to be accelerating toward me? ... And apparent receding distant galaxies with a red shift. ... www.astronomy.net . About Astronomy Net | Advertise on Astronomy Net | ... Forum posts are Copyright their authors as specified in the heading above the post. "dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET" . ...

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• Distant Suns, AstroGuide Listing

.

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• Physics 410/510 Observational Cosmology
• QSO Absorption Lines and Other Cosmological Probes
• Astronomy HyperText Book: Stellar Evolution

Next: Structure of the Galaxy Up: Model of the Galaxy Previous: Model of the Galaxy . As discussed above (Section  6 ), galactic binary systems are assumed to be distributed logarithmically along their semi-major axis A (Abt and Levy, 1976[ 2 ]), . ... Figure 40: Number of binary stars per frequency decade. ... As the observed distribution of binary periods is flat (equation ( 15.3.1 )), the normalization constant is the total number of galactic binaries per frequency decade: . ...

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• Binary Radiopulsars with Black Holes
• Sergei Popov
• A Gravitational Wave Map of Nearby Galaxies

Trudy GAISH, vol. LXV, 1996 . Abstracts . The global distribution of average (5 O x 5 O ) depths . of Mohorovicic discontinuity on the Earth . ... Such analysis allows detecting whether the sources of the largest anomalies reside within the Earth's core. This is possible if the limit depths of the sources exceed the depths of the core-mantle boundary. ... by Pasinok S.L. Influence of the Earth’s cover on the polar free oscillation of the Earth’s inner core is considered. ...

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... Exposure Time Calculator (ETC) . Survey processing . ... VISTA is a 4-m class wide field survey telescope for the southern hemisphere, equipped with a near infrared camera (1.65 degree diameter field of view at VISTA's nominal pixel size) containing 67 million pixels of mean size 0.34 arcsec and available broad band filters at Z,Y,J,H,K s and a narrow band filter at 1.18 micron. A wide field visible camera, if constructed, could also be used on VISTA. ... Tile . ... ESO VISTA Public Surveys . ...

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Cosmology, Religion & Kansas . ... Cosmology is the study of the origin, current state, and future of our Universe. ... My cosmology tutorial is an attempt to summarize these discoveries. ... These measurements of very small CMB temperature fluctuations over 1% of the sky with a beam size 40 times smaller than COBE's 7 o beam confirm earlier work by a group at Penn & Princeton and data from BOOMERanG's test flight, but provide 3 to 4 times more accuracy. ... Ned Wright's Home Page . ...

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• MIT_GB catalogs
• Eddington's Temperature of Space
• References

... About ATNF overview . ... Australia Telescope Steering Committee . ... Parkes radio telescope . ... A Search for Distant Satellites of Neptune . ... Previous surveys for distant satellites of Neptune have had relatively bright magnitude limits ( ) and would have missed satellites with magnitudes and colours similar to the 2 recently discovered Uranian satellites ( and ). ... This search is up to magnitudes deeper than the previous wide field search for distant satellites by the UK Schmidt Telescope....

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• Neutral Hydrogen Absorption Measurements of Four Distant Pulsars and the
• ASKAP discovers HI absorption in distant galaxy | Australia Telescope National
• ATNF Daily Astronomy Picture

... STScI-PRC97-25 HUBBLE ASTRONOMERS USE LENS IN NATURE TO UNCOVER MOST DISTANT GALAXY IN THE UNIVERSE [LEFT] A NASA Hubble Space Telescope image of the galaxy cluster CL1358+62 has uncovered a gravitationally-lensed image of a more distant galaxy located far beyond the cluster. The gravitationally-lensed image appears as a red crescent to the lower right of center. ... The image was taken with Hubble's Wide Field Planetary Camera-2 on January 13, 1996. ...

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• Arcetri Extragalactic Group
• Deep X-ray and IR study of the distant X-ray cluster XDCP J0044.0-2033 (Il
• Cannibal Stars Cause Giant Explosions in Fornax Cluster Galaxy (ESO Press

Next: Participant List . ... Table of Contents - Index . Cover Illustration: This figure, from the paper by Gary Ferland, Kirk Korista, and Dima Verner , summarizes the results of thousands of complete spectral synthesis calculations performed with the Cloudy program. ... These calculations show that this line-one of the strongest quasar emission lines-is produced efficiently only over a narrow range of physical conditions. ...

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• ADASS 2003 Conference Proceedings
• Parallelization of Widefield Imaging in AIPS++
• Refining the Guide Star Catalog: Plate Evaluations