... ESO is building what will be the World's largest optical telescope array, The Very Large Telescope (VLT). The VLT Project organisation is responsible for the design and construction of the Unit Telescopes, including enclosures, optics, adapter-rotators and coating unit. ... Unit Telescopes Overview - This page is outdated, an update is in process. ... Secondary mirror (M2 Unit) - This page is outdated, an update is in process. ... Coating Unit - This page is outdated, an update is in process. ...

... Tonight's Sky . ... The Magazine . ... Observing . ... The double star 54 Leonis, spiral galaxy NGC 3198, and emission nebula NGC 3199 . ... Astronomy for Kids . ... The Real Reality Show: Would aliens be anything like us? Observing springtime deep-sky objects with a large telescope . ... Appreciating a celestial light show . ... Get instant access to subscriber content on Astronomy.com! ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter. ...

... This plug-in enables you to add various types of lighting effects to your (RGB) image. ... Directional light . ... Well, you get the idea :) The default settings for this light-type is [-0.5,-0.5,-1.0]. ... Higher values makes your image reflect a lot of light (appear lighter or more intense), while smaller values makes it appear more dull or matte. ... A value of 1.0 makes your image very shiny (bright high-lights) while smaller values makes you image less shiny, making the high-lights dimmer. ...

SAS home . SAS Watchout items . ... This thread contains a step-by-step recipe to extract a light curve of a point-like source for all the X-ray cameras, subtracting the background and correcting for exposure loses. ... The SAS task barycen performs this correction. ... If the following files are available: a) RGS event list; b) RGS source list, a call to the task performing light curve extraction, correction and background subtraction rgslccorr allows a user to create the light curve. ...

... Bad Astronomy . Misconceptions . ... Bad Astronomy : "We're light years more advanced than our competition!" ... Even the closest astronomical object, the Moon, is 400,000 kilometers away! ... A beam of light will travel 9,500,000,000,000 kilometers in one year. This distance is defined as a light year ; the distance light travels in a year. ... This is another example of Bad Astronomy; like a light year, a parsec is a unit of distance, not time (to be specific, it equals 3.26 light years) . ...

... The Great Carina Nebula . ... A jewel of the southern sky, the Great Carina Nebula, also known as NGC 3372, spans over 300 light-years, one of our galaxy's largest star forming regions. ... Is the Sun always straight up at noontime? ... Hale Bopp: The Great Comet of 1997 . ... Sixteen years ago, Comet Hale-Bopp rounded the Sun and offered a dazzling spectacle in planet Earth's night. ... At a distance of about 1,500 light-years, the bluish nebula itself is about 5 light-years across. ... 1997 1998 ....

... The eleven years cycle of Sun's activity is approaching its maximum! From August 24th to 29th a team of astronomers, engineers and astro-photographers will travel to southern Greenland to observe the Northern Lights (Aurora Borealis), a phenomenon expected to be particularly spectacular during this period. ... Auroras . The wonderful celestial spectacle of the aurora occurs when very energetic particles from the Sun reach the Earth's atmosphere via the solar wind. ... About GLORIA . ...

To find out if a command name is located in your command path: which ue /usr/local/bin/ue . This returns the information that the MicroEMACS editor (ue) is available on this system as the file /usr/local/bin/ue . ... To find out which (if any) of several commands are available: which delete talk ps No delete in /usr/local/utils/bin:/bin:/usr/bin: /usr/local/ucb/bin:/usr/local/gnu/bin: /usr/local/public/bin:/usr/bin/X11:. /usr/bin/talk /bin/ps . ...

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Villains and Heroes of Lights and Lighting Fixtures . If we are to reduce the effects of light pollution, we must learn about the types, both good and bad, of fixtures used in outdoor lighting. ... In fact, this type of fixture is often chosen for this very reason. ... Although these lamps are not very energy efficient, and they are often found in older, inefficient fixtures that enhance light pollution, they still exist in great abundance in most locations and are still sold by the millions. ...

... a greenish glow is often seen in the sky, known as the "Northern Lights." ... During magnetic storms, the glow may move southwards, and on occasion it can be seen in much of the US. ... A similar phenomenon is also seen in southern polar regions. ... Auroral light is produced at a height of about 100 km (60 miles) when fast electrons, arriving from space, slam into atoms and molecules of the atmosphere. ... The green light of the aurora puzzled scientists for many years, since it fit no known...

... Note: Click here a longer, much more comprehensive overview of the polar aurora . ... Magnetic Field . ... Aurora . ... 3b. Fritz Aurora . ... Electrons . ... Typical aurora (Dick Hutchinson ї) . In Alaska, Canada, Norway, Finland or northern Russia, on a clear night, a greenish glow is often seen in the sky, known as the "Northern Lights." ... Auroral light is produced at a height of about 100 km (60 miles) when fast electrons, arriving from space, slam into atoms and molecules of the atmosphere. ...

... A survey of Armagh was to be carried out in order to better determine how much money is wasted each year in Armagh on bad lighting. ... Bad Up Light . ... This information allowed more accurate estimates to be made of how much light is wasted in Armagh, and therefore how much money and coal is wasted, as well as how much carbon dioxide produced. ... Lights per metre . ... denote the average percentage of light wasted per luminaire, wasted meaning ineffective lighting (up, to the sides etc.) . ...

... Abstract Return the speed of light in a vacuum (IAU official value, in km/sec). Required_Reading None. Brief_I/O The function returns the speed of light in vacuo (km/sec). ... Detailed_Output The function returns the IAU official value for the speed of light in vacuo: 299792.458 km/sec. ... Examples The following example uses clight_c to determine the one-way light-time (tau) to an object whose position relative to an observer is contained in pos. ... Files None. ... Link to routine source . ...

Next: *timsort* Up: Timing Analysis Previous: Summary of tasks in . ... Events will be time ordered in the output file. xt> timsort xdata$snr psr ``c 503 513 24'' none A light curve is then generated and plotted so we can inspect the gross properties of the sample (the sequence of good-data intervals and gaps) and any source variability. xt> ltcurv psr none psr 500 xt> ltcplot psr_ltc Finding this sample satisfactory, we search for periodicity with a fast Fourier transform. ...

Please enter the lightcurve file name and period search parameters: . Lightcurve file: . ... Apply the Heliocentric correction and convert all dates to Terrestrial Time (TT)? ... Also, the Heliocentric correction cannot be applied to such lightcurves. ... This period search service is also available at the mirror sites: Mirror 1 , Mirror 2 , Mirror 3 , Mirror 4 . You may download the latest source code distribution and install the period search service at your own web server. ...

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Stellarium 0.12.3 . ... Classes . ... FileљStructure . ... StelLocation Class Reference . Store the informations for a location on a planet. More... #include < StelLocation.hpp > . QStringљ . ... Output the location as a string ready to be stored in the user_location file. ... createFromLine (const QString &line) . ... Definition at line 26 of file StelLocation.hpp . ... line . ... Output the location as a string ready to be stored in the user_location file. int StelLocation::altitude . ...

... Image Quality of the VLT . Total Optical Control . First light for the ESO VLT unit telescope 1 occurred during the workshop. ... The image shown (Figure 1 ) here was obtained with the VLT on May 16, 1998, in red light (R band), i.e. while the mirror was still uncoated. ... In this diagram (FIgure 2), the measured image quality of the VLT UT1 astronomical images is plotted versus the ``seeing", as measured by the Seeing Monitor, a small telescope also located on top of the Paranal Mountain. ...

Modules | ... Apache HTTP Server Version 2.2 . ... Some files in the modules/experimental directory under the Apache distribution directory tree are provided as an example to those that wish to write modules that use the Apache API. ... If you link it into your server, enable the "example-handler" handler for a location, and then browse to that location, you will see a display of some of the tracing the example module did as the various callbacks were made. ... Using the mod_example Module . ...