... A sundial with a vertical pointer (" gnomon ") will indicate noon correctly when its shadow points north. ... Cut the paper along the marked line: one half will serve as base , the other will be used to construct the gnomon . In the gnomon part, cut away the two marked corners. ... With the page folded in its middle, cut out along the curved line , cutting a double thickness of paper in one cut. ... Score the other two secondary lines, then fold the gnomon sheet along them. ...

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... A sundial with a vertical pointer (" gnomon ") will indicate noon correctly when its shadow points north or south. ... Cut the paper along the marked line: one half will serve as base , the other will be used to construct the gnomon . In the gnomon part, cut away the two marked corners. ... With the page folded in its middle, cut out along the curved line , cutting a double thickness of paper in one cut. ... In cut (4), the fin of the gnomon was separated from two pieces with curved outlines. ...

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• Magnetic Field Lines

... X-Ray Ring Around SN1987A . ... Explanation: This false-color image from the Chandra X-ray Observatory reveals a one light-year diameter ring of hot, ten million degree plasma. It is one of the most detailed X-ray images of the expanding blast wave from supernova 1987A ( SN1987A ). At visible wavelengths SN1987A is famous for its evolving rings , and superposed on this image are white contour lines which outline the innermost optical ring as seen by the Hubble Space Telescope. ... About APOD | ...

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• APOD: 2005 December 19 - Thin Rings Around Polarized Saturn
• APOD: 2012 November 20 - A Halo Around the Moon
• APOD: 2011 July 14 - Neptune: Once Around

... The near-UV prism (NUVOP) transmits only above 1600 with a wavelength dispersion / around 100 at 2500 . ... The wavelengths determined from objective prism spectra using these dispersion curves should have a / error of <1% for f /96 spectra. ... 4000 . ... Overall, photometry of objective prism spectra should have errors of about 10% or less for wavelengths below 4000 for NUVOP spectra and below 2500 for FUVOP spectra, provided that the position of the undispersed target is known to within a pixel. ...

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... Thin Rings Around Polarized Saturn . ... Credit: Cassini Imaging Team , SSI , JPL , ESA , NASA Explanation: How thin are the rings of Saturn? ... The above artistic looking image was taken early last month in infrared polarized light. ... NASA Official: Jay Norris. ... Публикации с ключевыми словами: Saturn - saturn rings - поляризация света - Сатурн - кольца Сатурна . Публикации со словами: Saturn - saturn rings - поляризация света - Сатурн - кольца Сатурна . ... Древние кольца Сатурна . ...

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• Thin Rings Around Polarized Saturn
• Journal "Peremennye Zvezdy"
• A Halo Around the Moon

... If the Earth is round, the Sun must be north of the equator in northern summer, and south of the equator in northern winter. ... From the Earth's perspective, the Sun is spiraling from north to south and back again along the ecliptic (see figure 7 ). ... The round Earth, at the summer solstice. ... If the rotation axis of the Earth is tilted with respect to its orbit, the equator bobs back and forth, causing the Sun to be north for half the year, and south for the other half (see figure 9 ). ...

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• ASP: Using Multicultural Dimensions to Teach Astronomy

... This document and the attached postscript figure document an analysis that I did to determine the optimum midpoint and required ranges for both the rotator and azimuth for the 2.5 M telescope. ... I simulate a series of drift scans on the sky for tracks that cover the northern survey area. These tracks cover the range in survey latitude of -60 to +60 degrees, spaced by 10 degrees. ... Along each track the azimuth, elevation, and position angle of the CCD is computed at 1 minute intervals. ...

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. There are a range of easy to use commands that provide a great degree of flexibility in how you move around the contents of the file you are editing. Many of these commands can be combined with a numerical value to extend their functionality. Move the cursor along a line . Move the cursor between lines . Move between text blocks . Move over the file .

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• Move around the screen

.

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• Evolution of Intelligence

XMM-Newton Science Analysis System . ... For those whose heads began to ache at around the second equation, think of it this way: at each pixel of the image, the probability of recording events is given by the Poisson distribution corresponding to the expectation value . ... We can then assign a probability to the pixel value from equation 5 . Now let us multiply all the probabilities for individual pixels together. ... XMM-Newton SOC/SSC -- 2008-07-02 ...

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• Comments
• scisimquad

I was wondering what conditions should be met to have the "darkest" sky .. ... Upon the above publication of the Southern Galactic hemisphere, TunГ Tezel started seeking opportunities to create the Northern counterpart image. ... So, the initial quest of having the darkest possible sky have delivered us these two all-sky images of the two galactic hemispheres as seen from Planet Earth. Zoomable and 'full-screenable' fisheye view of the "darkest sky" Southern Galactic Hemisphere image. ...

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• All Around Chajnantor тАФ A 360-degree panorama

This is one of the first images taken by NASA's Curiosity rover, which landed on Mars at 5h32m UT August 6. It was taken through a "fisheye" wide-angle lens on one of the rover's front Hazard-Avoidance cameras at one-quarter of full resolution. The camera is the left eye of a stereo pair positioned at the middle of the rover's front side. The clear dust cover on the camera is still on in this view, and dust can be seen around its edge, along with three cover fasteners. ...

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• http://www.astronomy.com/sitefiles/resources/image.aspx?item=%7B6D9202E6-5456-4E02-9F2C-7A7AC0BCCA54%7D
• Everything around us is spinning: particles, planets, stars, galaxies. Why not

Next: A box, to include Up: To produce a region Previous: To produce a region . select cursor and circle . When in the image window, the mouse now has a box shape with an arrow at the upper left corner. The mouse buttons act as follows: . LEFT - to move the center of the circle at the position of the arrow point. ... RIGHT - idle. center the circle at the point source by positioning the arrow point and clicking on the LEFT mouse button. A circle will appear at the arrow position. ...

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• Tom's POVRay Wall-Mounted Magnifying Mirror
• *qprotate* -- Rotate a QPOE image about the origin
• Everyday Classroom Tools: Introduction to the Threads of Inquiry

On 6 may 2001 the azimuth was parked at az=214.4 degrees and the dome was at 19 degrees za with motors off and the brakes on. At 7:40:49 the azimuth started moving do to the wind. ... The operators began moving the dome downhill at azimuth 258 degrees. The dome was at 18 degrees by the time the azimuth stopped moving. The azimuth rail had been greased the previous week. ... The red shows the dome position during this time (the top red line is 19 degrees and the bottom one is 18 degrees). ...

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• http://www.naic.edu/~phil/turret/tsysvsangle.html
• azencRackGearRunout
• cleaning up the 327 band

... Gallery . ... Mars . ... Sidebar Left . Sidebar Top . No Sidebar . Sidebar Bottom . Sidebar Right . ... Title: Deimos orbiting Mars . ... In the animation, Deimos is moving along its orbit around Mars. Each frame is around 10 minutes apart. NOTE: All images and movies are copyright and must not be reproduced or mirrored in any form without written permission. ... Deimos orbiting Mars An over-exposed Mars and one of its moons, Deimos (faint spot in lower-left quadrant). ...

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• One way to get around Stromlo
• Snow around the Oddie
• C/2006 P1 (McNaught)

... The images that will be released over the next several days capture each of the 4 Galilean satellites in their orbits around the giant planet. This true color composite frame, made from narrow angle images taken on December 12, 2000 around 15 hours UTC (spacecraft event time) captures the innermost Galilean satellite, Io, and its shadow in transit again the disk of Jupiter. ... The image scale is 117 km/pixel. ... Credit: NASA/JPL/University of Arizona Released: December 20, 2000 ...

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• APOD: January 6, 1996 - Dwarf Elliptical Galaxy M32
• APOD: August 18, 1999 - Sun Block
• APOD: February 5, 1996 - COBE Dipole: Speeding Through the Universe

The Australia Telescope Compact Array ( ATCA ) is a radio interferometer consisting of six 22-m antennae aligned along a 6-km-long, east-west track. ... The ATCA Upgrade , which is part of the Major National Research Facility ( MNRF ) program, will allow astronomers to observe at even higher frequencies, around 22 GHz (12 mm) and 90 GHz (3.5 mm). ... The ATCA Upgrade will open a number of new opportunities; these are set out below. ... The ATCA Upgrade involves the following projects: . ...

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• Research - Compact high-velocity clouds around the Milky Way
• ksnow
• kpvslice: interactive position-velocity slicing

... A wordlwide network of amateur and professional astronomers record and time the mutual eclipses and occultations of the Galilean satellites as accurately as possible. ... Already, the acceleration of Io is evident in the data and continued monitoring through this coming season will help pin down the acceleration of the other three satellites. ... From Dr Apostolos Christou, Armagh Observatory: . ... If you want to know the observing times from your location get it by filling in this form . ...

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• Stars Beyond Maturity
• Searching for Planets Around Other Stars - from Galway: Monday 13 October 2008
• Armagh astronomer made today's highlights around the world | International Year

. Computer Ephemeris. Lunar physical observations. Explanations. Each row contains at 0h of Time Dynamical Terrestrial: month, day, selenographic longitude and latitude of the Earth (degrees), physical libration in longitude and latitude (degrees), 90 o minus selenographic longitude of the Sun and Sun's selenographic latitude (degrees), position angle of lunar axis of rotation (degrees), position angle of terminator (degrees), phase angle (degrees), illuminated part of lunar disk (demensionless).

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• Ephemeris of Saturnian rings. Explanations for Computer Ephemeris (DE200...
• Explanations to ephemeris for physical observation of the planets for Computer
• Lunar eclipce explanation page of Computer Ephemeris (DE200/LE200).

... This year's eclipse is unique in duration. ... Although, at the present time, there are 6 solar observatories belonging to leading space agencies in orbit around the Earth, the eclipse of 22 July, 2009, will only be seen by two of them: the Russian CORONAS-PHOTON satellite equipped with TESIS telescopes and Japan's HINODE satellite fitted with an XRT space telescope. ... TESIS will be the first of the two devices (and the very first on Earth) to witness the solar eclipse. ...

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• Project's diary
• NASA's Spitzer Images Out-of-This-World Galaxy - Astronomy news