This section describes the calculation by which Aristarchus used the duration of a total lunar eclipse to deduce the distance of the Moon. ... This lesson plan supplements: "How Distant is the Moon--1", section #8c: on disk Shipprc2.htm , on the web . ... The shadow of the Earth at the Moon's distance is narrower than the Earth, because the Sun is seen not as a point but as a disk 0.5 degrees wide. ... An eclipse of the Moon is the passage of the Moon through the shadow of the Earth. ...

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• Could Earth be Revolving around the Sun?
• How Distant is the Moon?--lesson plan #15
• How distant is the Moon?

... The greater the distance, the smaller the parallax. ... That triangle has the same proportions as the much larger triangle ABC, and therefore, if the distance B'C to the thumb is 10 times the distance A'B' between the eyes, the distance AC to the far landmark is also 10 times the distance AB. ... The most distant objects our eyes can see are the stars, and they are very far indeed: light which moves at 300,000 kilometers (186,000 miles) per second, would take years, often many years, to reach them. ...

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• How distant is the Moon?
• How Orbital Motion is Calculated

An Ancient Universe: How Astronomers Know the Vast Scale of Cosmic Time . THE ANCIENT UNIVERSE . c) The Age of Light from the Most Distant Galaxies: The "Time Machine" Effect . ... Thus we are actually seeing these galaxies not as they are today, but as they were billions of years ago. ... The Universe: An Overview | ... 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: Biography of a Star: Our Sun's Birth, Life, and Death
• ASP: The New and Improved Hubble Space Telescope
• ASP: Beacons in the Gloom

... Bad Astronomy . ... Bitesize Astronomy . ... Keep Bad Astronomy close to your heart, and help make me filthy rich. ... If you said Pluto, sorry, that's incorrect. ... However, that's two-dimensional thinking; actually, the orbits are tilted and never intersect. ... Pluto has a very large moon named Charon, which revolves around Pluto in a very tight orbit (actually, the two both circle a common center of gravity). ... I have a small bit about Pluto in my Bad News section too! 2008 Phil Plait. ...

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• Phil Plait's Bad Astronomy: Bad TV
• Phil Plait's Bad Astronomy: Misconceptions
• Phil Plait's Bad Astronomy: Bitesize Astronomy

Astronomy Picture of the Day . ... Eris: More Massive than Pluto . ... Monitoring M2-9 . ... About 2,100 light-years away and over one light-year across, M2-9 is known as a twin jet or butterfly nebula in reference to its striking bipolar symmetry. ... Of course M96 is a spiral galaxy, and counting the faint arms extending beyond the brighter central region it spans 100 thousand light-years or so, about the size of our own Milky Way. vdB 152: Reflection Nebula in Cepheus . ... 100 | ...

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The azimuth encoder rack gear is mounted on the inside of the azimuth ring girder. The azimuth encoder turns on this gear as the azimuth moves 0 to 720 degrees. ... The software assumes that this arc length along the encoder rack gear is correct (at a constant radius of 127/2 feet). The error in the radius of the rack gear becomes an azimuth error. To measure the error in the azimuth encoder rack gear, jon hagen built a proximity sensor. ... To compute the az encoder runout error: . ...

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• WAPP File Format Page
• changing rolling surface

Russian SHAREABLE DATA CENTER Institute of Solar-Terrestial Physics SB RAS . ... The algorithm and appropriate program for decametric radiosignal propagation conditions prediction for paths from 500 to 9000 km have been developed at ISTP SB on the basis of normal wave method (AltyntsevaB.I,Iliyin N.V., Kurkin V.I. and others //Decameters channel simulation on the base of normal wave method . ... Solar activity indices are chosen automatically from the prediction date from the database . ...

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... May 13, 1997 . Optical Transient Near GRB970508 Shows Distant Redshift . ... Explanation: The GRB distance scale controversy may have just ended with a flash . ... 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 . ... Above is a "negative" image of the GRB970508 field , located near the north celestial pole, taken hours after the initial flash of gamma rays. ... About APOD > . ...

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• APOD: 2004 December 10 - Debris Disks Surround Distant Suns
• APOD: 2013 April 8 - A Redshift Lookup Table for our Universe
• APOD: 2001 February 22 - 3C294: Distant X Ray Galaxy Cluster

Program: 3DPLOT Purpose: View Set, subset in perspective Category: PLOTTING File: 3dplot.c Author: M. Vogelaar Keywords: INSET= Give set (, subsets) to plot: Maximum number of subsets is 2048. ... PAPER= Give width(cm), aspect ratio: [0.0,1.0] Aspect ratio is height/width. ... DISTANCE= Distance of the eye from the screen: [calculated] Control amount of perspective with this unitless number. ... sin(th) -cos(th)*cos(ph) -cos(th)*sin(ph) 0.0 | cos(th) -sin(th)*cos(ph) -sin(th)*sin(ph) 0.0 | ...

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• The Beam Properties at the Distance of the Earth
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• A Search for Distant Satellites of Neptune

... smoothstyle =`adaptive'. This is exactly the same as the patchwork convolution described in section 3.3.4 , except here the task calculates the library of convolvers and the associated index image itself. ... The task actually makes two passes through the library of gaussians: the first as described above, to calculate the index image; the second refers to the index image while performing the convolution, exactly as described in section 3.3.4 . ...

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• Introduction

The Steady State model of the Universe was proposed in 1948 by Bondi and Gold and by Hoyle. ... At the time the Steady State model was proposed, the Big Bang model was in trouble because the value of the Hubble constant was clearly bigger than the inverse of the age of the Universe. ... Thus the Steady State model has flat spatial sections like the critical density Big Bang model. ... The Steady State model has no adjustable parameters to correct for this error, but the Big Bang does. ...

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• Mean astrophysical parameters from LEDA
• Cosmology Tutorial - Part 2
• Other Methods

... 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
• Expanding Universe | Astronotes
• How Did New Horizons Get to Pluto So Quickly? | Astronotes

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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• IDL programs

... Neptune is smaller in diameter but larger in mass than Uranus . ... An international dispute arose between the English and French (though not, apparently between Adams and Le Verrier personally) over priority and the right to name the new planet; they are now jointly credited with Neptune's discovery. ... A t the time of the Voyager encounter, Neptune's most prominent feature was the Great Dark Spot (left) in the southern hemisphere. ... more Neptune images . ... What happened to the Great Dark Spot...

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• Z Cnc
• Educator's Guide to The Inverse Square Law
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... Currently, there is very little information on comets which are active beyond the orbit of Jupiter. ... Previous observations conducted by our team with the SAO RAS 6-m telescope showed that some of these comets have extended tails dissimilar to the tails of comets forming at close heliocentric distances. ... We for the first time measured the linear polarization of scattered emission for the two distant comets C/2010 S1 (LINEAR) and C/2010 R1 (LINEAR) at heliocentric distances of 5.9-7.0 au. ...

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... We have measured this "redshift" for the pink black holes, and allowed for it in our calculations. ... We see this effect in the emission from gas around these pink black holes, but it is far too small an effect to account for the pinkness. Thus the swirling motions of gas around or into the black holes cannot produc the colour. ... At first we thought that these things were normal blue black holes hidden behind clouds of interstellar dust, that absorbed the blue light and made them appear pink. ...

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• The High-Z SN Search Description

... Tonight's Sky . тАФ . ... RISE тАФ . ... Observing . ... Star Atlas . ... Astronomy for Kids . ... Observing springtime deep-sky objects with a large telescope . ... What exactly is a degree in terms of the distance between stars? ... A measurement in degrees has nothing to do with the true distances between celestial objects. ... Get instant access to subscriber content on Astronomy.com! ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter. ...

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• Hubble captures a cross-section of the universe | Astronomy.com
• Moon and distant quasars facilitate first measurement of magnetic field in
• Most distant galaxy: Hubble breaks cosmic distance record | Astronomy.com

Following designations of elements/ parameters are used in AMPLE. ... mean anomaly . ... Node . ... Apart conventional orbital elements AMPLE gives possibility to calculate for each minor planet the following often used functions: . ... MOID . ... To calculate MOID user should order the name or the number of the major or minor planet through dialog. ... To calculate CT user should order the name or the number of the major or minor planet through dialog as it is proposed for MOID calculation. ...

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• ENGAMPLE

. Album : asv-album :: Travels to distant places and countries :: 1997/08 Kyoto, Nara (Japan) :: 23/08 Ryoanji Temple and around . Up . << Prev . A bug which produces loud high-pitched noise. The actual length is about 5-6 cm. Next >> . Created with the tool album generator a MarginalHack by David on Tue Jun 23 14:46:19 2015 .

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• Image: I believe this is the actual Otani shrine. Otani was a monk who founded
• Image: You probably get bored to see hotel again :-) But actually, there wasn't
• Keyword arguments and default arguments

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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• Cool Ideas Krill - an Astronomy Net Blackholes2 Forum Message
• Lunar Libration - an Astronomy Net Article
• Black Holes And RedShift - an Astronomy Net Blackholes Forum Message