... 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 Unit Telescopes Overview - This page is outdated, an update is in process.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 Secondary mirror (M2 Unit) - This page is outdated, an update is in process.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 Coating Unit - This page is outdated, an update is in process. ...

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. ...

... 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) . ...

... You are the Imperial College, London . ... Sun Aug 30 11:56:56 EST 1998 ...

... 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. ...

... Following the Observatory's initiative in 2002, drawing attention locally to the issue of light pollution and the problems it produces both for astronomy and awareness of the night sky, and for saving energy and improving the natural environment, Mark Bailey made a presentation on light pollution, on 7 May 2003, to the Armagh City and District Council Environment, Health and Recreation Committee. This focused specifically on the growing problem of light pollution in the City of Armagh. ...

... 16.01.2012 . ... Called zodiacal light , the glowing triangle of light may be mistaken, for a while, for a sunrise, and so may be called a false dawn. ... At its brightest, the rising zodiacal triangle on the left glows brighter than even the central disk of our Milky Way Galaxy -- visible as the diagonal band moving left to right across the frame. ... Publications with keywords: zodiacal light - sunrise . Publications with words: zodiacal light - sunrise . ... Zodiacal Light and Milky Way . ...

... 2012 January 16 . Zodiacal Light and the False Dawn . ... Explanation: Is it dawn or false dawn? During certain times of the year, the horizon near the rising Sun will begin to glow unusually early. ... Called zodiacal light , the glowing triangle of light may be mistaken, for a while, for a sunrise, and so may be called a false dawn. ... About APOD | ... NASA Official: Phillip Newman Specific rights apply . NASA Web Privacy Policy and Important Notices . ...

... See "About ATMoB" / "Network" for more details on the clubhouse network. ... Direct viewing of a laser-pointer beam, even briefly and at a distance of a kilometer or two, has the potential to cause temporary flash blindness — the same effect you get right after a flash photo is taken — or afterimages. ... To help use our laser tools safely, the Amateur Telescope Makers of Boston, Inc. has adopted these recommendations as policy. ... Copyright (c) Amateur Telescope Makers of Boston, Inc. ...

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. ...