1. Discovery Telscopes, Incorporated Manufacturer of optics and complete telescopes. http://www.discovery-telescopes.com/

Discovery Telescopes, Incorporated click here to see the Discovery Difference RECENT CUSTOMER COMMENTS: visit their website at: www.astrophoto.com "...words fail to describe the perfection of the primary mirror you made for us. I have NEVER seen anything like this before ...this mirror appears to be perfect! The inside-outside is so identical there is not the slighest clue which side of focus you are on. The Ronchi lines are so straight they look fake." "The action of the scope is excellent...very smooth motion... it is obvious that you have cut no corners in the construction." "I see now the other two (Discovery) 17.5" scopes that I looked through were no accident... your mirrors are the best I have ever seen... I don't know how you do it, but you have a severe talent for making extraordinay optics." "...stars appear as tiny, dazzling pinpoints of light...images like M13 take on a whole new appearance, and seeing the central star in the ring nebula with averted vision in a 17.5" mirror becomes routine. We cannot be more pleased with this telescope, and we have had many scopes over the years." WHY NOT PROVE IT TO YOURSELF WITH DISCOVERY'S EXCLUSIVE 60 DAY MONEY BACK GUARANTEE.

2. Orion Telescopes Large discount catalog of telescopes, binoculars, and accessories. Full online catalog, sameday Category Science Astronomy Dealers......Catalog Request Catalog Quick Shop Product Wizard Clearance Learning Center CustomerService My Account. telescopes Binoculars Accessories. Home. Site Map. http://www.telescope.com/

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3. Telescopes In Education (TIE) The World's Largest Optical telescopes. Operational. Aperture (meters) http://tie.jpl.nasa.gov/tie

4. Telescopes Find an extensive alphabetical list of links to professional telescope information and observatory sites for astronomers. Observatory operates the AngloAustralian and UK Schmidt telescopes at Siding Spring, Australia, and a laboratory on http://www.cv.nrao.edu/fits/www/yp_telescope.html

Telescopes 1st High Energy Astrophysics Observatory ( HEAO 1. GSFC. NASA ) The first of NASA's three High Energy Astronomy Observatories, HEAO 1 was launched aboard an Atlas Centaur rocket on 12 August 1977 and operated until 9 January 1979. During that time, it scanned the X-ray sky almost three times over 0.2 keV - 10 MeV, provided nearly constant monitoring of X-ray sources near the ecliptic poles, as well as more detailed studies of a number of objects through pointed observations. 2nd High Energy Astrophysics Observatory ( HEAO 2, renamed Einstein. GSFC. NASA ) The second High Energy Astronomy Observatory (HEAO-B) was launched into an approximate 100-min low Earth orbit on 13 November 1978. Renamed the Einstein Observatory, it operated (with one significant interruption) until April 1981 and made over 5,000 targeted observations. A Broad-Band Imaging X-ray All-Sky Survey ( ABRIXAS ) ABRIXAS is a small satellite mission which was planned to observe the X-ray sky in the energy band 0.5-10 keV. The mission failed shortly after launch in Spring 1999. Active Magnetospheric Particle Tracer Explorers ( AMPTE ) Advanced Camera for Surveys ( ACS ) The Advanced Camera for Surveys (ACS) will be installed in the Hubble Space Telescope (HST) during a Space Shuttle mission scheduled in 2000. ACS will increase the discovery efficiency of the HST by a factor of ten. ACS will consist of three electronic cameras and a complement of filters and dispersers that detect light from the ultraviolet at 1200 angstroms to the near infrared at 10,000 angstroms.

5. Isaac Newton Group Of Telescopes on the island of La Palma in The Canary Islands. Details about the facilities offered on the 4.2-m Category Science Astronomy International Facilities......The Isaac Newton Group of telescopes (ING) operates three worldclasstelescopes on La Palma, Canary Islands, Spain. The Isaac http://www.ing.iac.es/

News: Change to PATT Submission Deadlines Spectacular Views of an Exploding Star First light on LIRIS ING Newsletter No. 6 ... Satellites and Tidal Streams Conference The Isaac Newton Group of Telescopes has been selected to receive the Griffith Observatory Star Award for excellence in promoting astronomy to the public through the World Wide Web ING web site: http://www.ing.iac.es UK mirror site: http://www.ast.cam.ac.uk/ING/

6. Dave Stevick's Weird Telescopes Page Features several unique solutions for telescope issues. http://bhs.broo.k12.wv.us/homepage/alumni/dstevick/weird.htm

w e i r d Telescopes A big West Virginia welcome to my weird telescope page. Achieving the very best views of the night sky is what this page is about. Showcased here are a variety of solutions by individuals in search of the perfect image. These instruments all seem strange: the need to use mirrors while keeping them from shadowing each other gives these telescopes odd geometries. Come join the quest. He appointed the moon for seasons: the sun knoweth his going down. Thou makest darkness and it is night: Anderson-Newtonian Carl Anderson's telescope resists easy classification. The primary is spherical but is too short to work as a Herschelian. Residuals of coma and astigmatism are removed by mechanically bending the primary using either of two schemes. A must see World's first binocular TCT At long last, the world now has a working tilted-component binocular. This achievement, a dream for many of us, was pulled off by John Francis. John has information about this newly completed telescope on his web site Brunn Telescope Austrian amateur, Guntram Lampert built this Brunn Telescope, the first tetra-schief named for its original designer.

7. Large Telescopes index of the world's largest groundbased optical telescopesCategory Science Astronomy Optical and Infrared Large telescopes......The World's Largest Optical telescopes. Operational. Aperture (meters),Name, Location, Latitude; Longitude Altitude, Comments. 10.0, Keck, http://www.seds.org/billa/bigeyes.html

The World's Largest Optical Telescopes Operational Aperture (meters) Name Location Latitude; Longitude Altitude Comments Keck Mauna Kea , Hawaii 19 50 N; 155 28 W 4123 m mirror composed of 36 segments Keck II future optical interferometry Hobby-Eberly Mt. Fowlkes, Texas 30 40 N; 104 1 W 2072 m very inexpensive: spherical segmented mirror; fixed elevation; spectroscopy only Subaru Mauna Kea, Hawaii 19 50 N; 155 28 W 4100 m NAOJ Antu Cerro Paranal , Chile 24 38 S; 70 24 W now operate independently in the future will be units of Very Large Telescope Kueyen Melipal Yepun ... Gillett Mauna Kea, Hawaii 1950 N; 155 28 W 4100 m aka Gemini North Gemini South Cerro Pachon , Chile 30 20 S;70 59 W (approx) 2737 m twin of Gemini North MMT Mt. Hopkins, Arizona 31 41 N; 110 53 W 2600 m Walter Baade La Serena, Chile 29 00.2 S; 4 42 48 W 2282 m aka Magellan I; Las Campanas Obs. Landon Clay aka Magellan II Bolshoi Teleskop Azimutalnyi Nizhny Arkhyz, Russia 43 39 N; 41 26 E Large Altazimuth Telescope Hale Palomar Mountain, California 33 21 N; 116 52 W 1900 m William Herschel La Palma, Canary Islands, Spain 28 46 N; 17 53 W

8. The Telescope The telescope was one of the central instruments of what has been called the Scientific Revolution of the seventeenth century. But although Galilean telescopes of higher magnifications were certainly made, they were almost useless because of the http://es.rice.edu/ES/humsoc/Galileo/Things/telescope.html

The Telescope The telescope was one of the central instruments of what has been called the Scientific Revolution of the seventeenth century. It revealed hitherto unsuspected phenomena in the heavens and had a profound influence on the controversy between followers of the traditional geocentric astronomy and cosmology and those who favored the heliocentric system of Copernicus. It was the first extension of one of man's senses, and demonstrated that ordinary observers could see things that the great Aristotle had not dreamed of. It therefore helped shift authority in the observation of nature from men to instruments. In short, it was the prototype of modern scientific instruments. But the telescope was not the invention of scientists; rather, it was the product of craftsmen. For that reason, much of its origin is inaccessible to us since craftsmen were by and large illiterate and therefore historically often invisible. Although the magnifying and diminishing properties of convex and concave transparent objects was known in Antiquity, lenses as we know them were introduced in the West at the end of the thirteenth century. Glass of reasonable quality had become relatively cheap and in the major glass-making centers of Venice and Florence techniques for grinding and polishing glass had reached a high state of development. Now one of the perennial problems faced by aging scholars could be solved. With age, the eye progressively loses its power to accommodate, that is to change its focus from faraway objects to nearby ones. This condition, known as

9. Dobsonian Telescope Obsession Manufacturer of Dobsonian telescopes.Category Science Astronomy Manufacturers...... Obsession telescopes PO Box 804W-Lake Mills, WI 53551 USA. UPDATED 3/21/03. Obsessiontelescopes LLC - PO Box 804W - Lake Mills, WI 53551 USA - 920-648-2328. http://www.globaldialog.com/~obsessiontscp/OBHP.html

Large aperture Dobsonian telescopes for observers that want the best. Find out below why nothing else comes even close to an Obsession Telescope. We've tried to include most of our product information here on the Web, however you can still order the printed versions below to have and hold in your own hands! Infra-red photo of star guide and 18" Obsession at a public Star Walk at Copper Breaks State Park near Quanah, Texas. These public astronomy programs are held in cooperation with the Texas State Park system and feature half a dozen Obsession telescopes ranging in aperture from 15 to 30 inchs. Photo taken by Fred Koch. Klicken hier fur Deutschen, Declic ici pour les francais, Tecleo aqui para los espanoles, Scatto qui per italiano, Clique aqui para portugueses (WEBSITE TRANSLATIONS) Check Out Our Online Flyer Latest Scoop on Obsession Updates 5 Scopes Listed on Stats/Price List/Ordering info Can your scope do this? M-13 Comparison Thinking About a New Scope? Think Big! From The Obsessed: Customer Comments Reviews of the Obsession 18 and 20: Read Ed Ting's reviews Compare BEFORE you buy: Big Dob Checklist ServoCAT drive: GoTo and tracking for your Obsession Argo Navis: Powerful digital setting circles Obsession Mouse Pads: Put the Virgo Cluster on your work station for only $5 We Helped Start Big Scope Fever: Obsession¨ FIRSTS!

10. The BAIT Home Page Unattended astronomical telescopes with electronic cameras to search for supernovae and monitor the brightness of celestial objects. http://astro.berkeley.edu/~bait/

Welcome to the Official Web Site of the Unattended astronomical telescopes with electronic cameras to search for supernovae and monitor the brightness of celestial objects. Please visit our two facilities: The Leuschner Berkeley Automated Imaging Telescopes The Katzman Automatic Imaging Telescope Or get: Download a detailed description of the facility Weather up at Lick Observatory BAIT Technical documentation rtreffers@astro.berkeley.edu

11. Meade Instruments Corporation - World's Leading Manufacturer Of Astronomical Tel Products include astronomical telescopes and accessories, eyepieces, CCD imaging equipment, astronomical Category Science Astronomy Manufacturers......World's leading manufacturer of astronomical telescopes for the seriousamateur astronomer. Products include astronomical telescopes http://www.meade.com/

MEADE EUROPE MEADE INTERNATIONAL BRESSER OPTIK SIMMONS OPTICS MEADE EUROPE MEADE INTERNATIONAL BRESSER OPTIK SIMMONS OPTICS ... REDFIELD OPTICS

12. It Takes More Than One Kind Of Telescope To See The Light Educates readers on the different types of telescopes used and why diverse technologies are necessary for the advancement of space research. be solved by comparing images of different wavelengths, telescopes are only designed to detect a particular portion of http://science.nasa.gov/newhome/headlines/features/ast20apr99_1.htm

Space Science News home It takes more than one kind of telescope to see the light Why we need different types of telescopes to look at outer space Feature Story: NASA NASA Science News presents "Feature Stories", where you can sit back, relax, and enjoy an in-depth look at ongoing research (or sometimes a story that's just plain fun). April 20, 1999 : By studying the electromagnetic emissions of objects such as stars, galaxies, and black holes, astronomers hope to come to a better understanding of the universe. Although many astronomical puzzles can only be solved by comparing images of different wavelengths, telescopes are only designed to detect a particular portion of the electromagnetic spectrum. Astronomers therefore often use images from several different telescopes to study celestial phenomena. Shown below is the Milky Way Galaxy as seen by radio, infrared, optical, X-ray and gamma-ray telescopes. The Multi-Wave Milky Way Galaxy radio infrared visual X-ray gamma ray Different types of telescopes usually don't take simultaneous readings. Space is a dynamic system, so an image taken at one time is not necessarily the precise equivalent of an image of the same phenomena taken at a later time. And often, there is barely enough time for one kind of telescope to observe extremely short-lived phenomena like gamma-ray bursts. By the time other telescopes point to the object, it has grown too faint to be detected.

13. Telescope FAQ - Index FAQ from Perkins Observatory. http://www.perkins-observatory.org/FAQ.index.html

Illustration by Rich Harrington. Reprinted from February 1994 Purchasing Amateur Telescopes What you should know BEFORE you buy! Dennis Bishop The link structure used, minor additions, and some images, are Bob Martino Don't even THINK of plagiarizing any of this. Our lawyers will put you in the comfy chair and poke you with the soft cushions. NOTE You may do a lot of clicking back and forth between the pages of this FAQ. If so, it might be a good idea to increase the cache size of your web browser so that you don't have to sit waiting for the pages to reload over and over again. Questions in this FAQ: Most important things to know. READ THIS FIRST! Defining Terms. What Does All the Jargon Mean? What Are Some Good Introductions To Amateur Astronomy? ... Telescopes Listed by Price 7. OK, Where Do I Buy My Telescope? Three Ways to Buy a Telescope From a store Through the mail Buying used ... About this FAQ If this FAQ did not answer all of your questions, please send e-mail to the expert and ask away! [Perkins Homepage] [Return to FAQ Index] [Previous Page] [Next Page] e-mail to: tlburns@owu.edu

14. The Telescopes The telescopes music news and much more . The telescopes. Enter. www.thedarlingbuds.com http://www.thetelescopes.co.uk/

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15. Electro-Optical & Telescope Optics; Lidar, Systems, Observatory Design And Consu Dealer, manufacturer and sales support specialists for computercontrolled telescopes and equipment. Company also offers telescope retrofitting. http://www.dfmengineering.com

16. Www.telescopes.uk.com Astronomy Astronomical Telescopes Equipment Reviews Books A resource site for amateur astronomers. Includes, information, advice, equipment reviews, listings of manufacturers, and amateur telescope making. http://www.telescopes.uk.com/

A one-stop site for UK based amateur astronomers by John Franklin. WANTED: Your equipment reviews for posting on this site. email: reviews@telescopes.uk.com Shadows: observer and 4" f15 refractor Recommended Books Equipment reviews UK Telescope dealers Magazines ... Used equipment When you buy books through this site, a small commission is paid by Amazon.co.uk or Amazon.com (this has no effect on the price you pay). This helps towards the running costs of the site. Thanks for your support. email: john_franklin@telescopes.uk.com

17. Orion Telescopes America's largest direct source of telescopes, binoculars, and accessoriesfor amateur astronomers and nature enthusiasts. Full http://www.telescope.com/interact/default.asp

We're sorry, but the page you are looking for cannot be accessed. It may have been removed, had its name changed, or may be temporarily unavailable. You will be automatically redirected to our new home page in 15 seconds. If you are not redirected, or would like to access our new home page sooner, please click here to continue. If this problem persists, please contact our Customer Service department at 1(800)-676-1343. Home Email Signup Product Support About Us ... Site Map 800-447-1001 Telescope.com

18. Astronomical Optical Interferometry The use of multiple telescopes to produce high resolution images commonly used at most modern observatories. A literature review article. http://www.geocities.com/CapeCanaveral/2309/page1.html

Astronomical Optical Interferometry A Literature Review by Bob Tubbs St John's College Cambridge April 1997 - updated 2002 Abstract This report documents the development of optical interferometry and provides a physical explanation of the processes involved. It is based upon scientific papers published over the last 150 years, and I have included references to the ones which are most relevant. The reader is assumed to have an understanding of modern optical theory up to undergraduate level - References 28 and 29 give explanations at a more basic level. The formation of images from interferometric measurements is discussed and several example images are included. Introduction Fizeau first suggested that optical interferometry might be used for the measurement of stellar diameters at the Academie des Sciences in 1867 . The short wavelength of light and the absence of sensitive calibrated detectors precluded more sophisticated interferometric measurements in the optical spectrum for over a century. After the Second World War most researchers instead turned to the radio spectrum, where macroscopic wavelengths and electronic detection greatly simplified the measurement of interferometric quantities. Modern computers, lasers, optical detectors and the data processing techniques developed for radio interferometry have recently enabled astronomers to produce high resolution images with optical arrays. At present only a few optical interferometer arrays are capable of image formation but many more are planned or under construction. The basic principles underlying the operation of optical interferometers have not changed, so I begin with a look at some of the earliest instruments.

19. The Gemini 8m Telescopes Project - Other Partner Projects The Royal Greenwich Observatory (RGO). The Royal Observatory, Edinburgh(ROE). The Isaac Newton Group of telescopes at La Palma (ING). Canada. http://www.gemini.edu/project/offsite.html

Other Astronomical Projects of the Partner Countries The United States National Optical Astronomy Observatory (NOAO) Cerro Tololo Interamerican Observatory (CTIO) The American Astronomical Society The United Kingdom The Joint Astronomy Centre (JAC) The Royal Greenwich Observatory (RGO) The Royal Observatory, Edinburgh (ROE) The Isaac Newton Group of Telescopes at La Palma (ING) Canada The Canada-France-Hawaii Telescope (CFHT) The Canadian Astronomy Data Centre (CADC) Dominion Astrophysical Observatory (DAO) Australia The Anglo-Australian Observatory Astronomical Society of Australia Chile CONICYT Brazil The Laboratorio Nacional de Astrofisica Web Page (LNA) Ruth A. Kneale / web@gemini.edu / June 8, 1998

20. Woodland Hills Camera & Telescopes - Best Prices - Best Service TOLL-FREE 1-888- Large selection of binoculars, cameras, telescopes and accessories made by Meade, Celestron, TeleVue and other maufacturers. http://telescopes.net

ORDER TOLL FREE: Happily Serving You for Over 50 Years BLOW-OUT CELESTRON Sale Price $ 349.00 C120-HD (Was $ 449.00) SPECIAL Tele-Vue 2" Diagonal Mirror Talk to the REPS. See the DEMOS FREE 2x Deluxe Barlow, #497 Autostar MEADE ETX 90EC 495.00 ETX 105EC 695.00 ETX 125EC 895.00 Bushnell ... Coronado Fujinon JMI Kendrick Leica Losmandy ... Zeiss Celestron announces a new Advanced Series line of computerized scopes C4-R Refractor C6-R or C6-RGT Refractor C6-N Newtonian C8-N or C8-NGT Newtonian Taking Pre-Orders C10-N or C10-NGT Newtonian C5-S or C5-SGT Schmidt-Cassegrain C8-S or C8-SGT Schmidt-Cassegrain C9 1/4-S or C9 1/4-SGT Schmidt-Cassegrain ... NexStar (Offer Extended until March 31, 2003 CELESTRON $500.00 INSTANT REBATE EXTENDED until April 30, 2003 Also get a FREE Starter Kit !! Purchase A NexStar 8 GPS And Receive A INSTANT REBATE OFF THE ALREADY LOW PRICE OF FREE #882 Field Tripod, ... Meade ETX 70AT Delivered to your door for OUR NEW LOWER PRICE $ 299.00

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