1. Orion Telescopes And Binoculars America s largest direct source of telescopes, binoculars, and accessories for amateur astronomers and nature enthusiasts. Full http://www.telescope.com/

var homeSrcArr = new Array ( "/images/us/local/localnav/telescopes_hm_btn_on.gif", "/images/us/local/localnav/telescopes_hm_btn_off.gif", "/images/us/local/localnav/binoculars_hm_btn_on.gif", "/images/us/local/localnav/binoculars_hm_btn_off.gif", "/images/us/local/localnav/accessories_hm_btn_on.gif", "/images/us/local/localnav/accessories_hm_btn_off.gif", "/images/us/local/page_specific/home/default_roll.jpg", "/images/us/local/page_specific/home/telescope_roll.jpg", "/images/us/local/page_specific/home/binoculars_roll.jpg", "/images/us/local/page_specific/home/accessories_roll.jpg", "/images/us///local/kickers/home/04_05_04_Home_d_Summer.jpg" ); preLoadCatImages(homeSrcArr); FREE CATALOG Request our colorful catalog, filled with hundreds of quality products. Hot New Products! Check out all of our hot new products. Scopes, binoculars, and accessories - all gathered together in one place for your convenience. ... discover the wonders of Spring Comets: NEAT and LINEAR Why Buy From Orion? Guaranteed 100% Satisfaction We stand behind every one of our products. If something doesn't perform to your expectations, just return it within 30 days for a prompt refund.

2. Telescopes In Education (TIE) Live Astronomy from Mount Wilson to the classroom The telescopes in Education (TIE) program brings the opportunity to use a remotely controlled their critical thinking skills. telescopes In http://tie.jpl.nasa.gov/tie

3. Discovery Telscopes, Incorporated Offers a complete line of Dobsonian reflectors up to 24 in aperture, plus optical primaries and elliptical flats. http://www.discovery-telescopes.com/

Discovery Telescopes, Incorporated 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.

4. Telescopes 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. the AngloAustralian and UK Schmidt telescopes at Siding Spring, Australia, and a laboratory 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. 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. Advanced Fiber-Optic Echelle ( AFOE ) A Spectrograph for Precise Stellar Radial Velocity Measurements.

5. Celestron - Home Advanced Series telescopes. CGE Series telescopes. NexStar 11GPS Design Comparison http://www.celestron.com/

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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 The World s Largest Optical telescopes. Operational. 4x1.8, PanSTARRS, Hawaii, Four separate telescopes; optimized for surveys; cheaper than LSST. 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 LZT British Columbia, Canada 49.28 N; 122.57 W Liquid mirror, points only at the zenith; UBC Hale Palomar Mountain, California

8. Telescopes Chapter index in this window . Chapter index in separate window. This material (including images) is copyrighted!. See my copyright notice for fair use practices. detect the visible (optical) band, so the early telescopes were all built to observe in that part of has enabled astronomers to put telescopes above the atmosphere and explore all http://www.astronomynotes.com/telescop/s1.htm

Telescopes Chapter index in this window Chapter index in separate window This material (including images) is . See my for fair use practices. Men and women have looked up at the sky and wondered about the things they see up there for as long as humans have lived on our Earth. Long ago, the Sun and Moon were mysterious objects that could be seen in the day and night. But the planets and stars were even more mysterious probably because they are so far away that we could only see them as points of light. Unlike the things on the Earth that we can study up close, handle, listen to, smell, and taste, the only thing ancient watchers of the sky had to learn about things in space was their eyes and imaginations. Only very recently in the history of humanity have astronomers been able to extend the reach of our eyes (and our imaginations!). Galileo pioneered modern explorations in the early 1600's by using a device originally invented for naval operations to explore the heavens. The device he used, of course, was the telescope , an instrument used to gather and focus light. Our atmosphere prevents most of the electromagnetic radiation from reaching the ground, allowing just the visible band, parts of the radio band, and small fractions of the infrared and ultraviolet through. Our eyes can detect the visible (optical) band, so the early telescopes were all built to observe in that part of the electromagnetic spectrum. It wasn't until the 1930's that astronomers began observing with another part of the electromagnetic spectrum-the radio band. The development of space technology has enabled astronomers to put telescopes above the atmosphere and explore all of those places out there using the full range of the electromagnetic spectrum. This chapter covers the basics of telescopes and the effects of the atmosphere on images. Vocabulary terms are in

9. 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

10. Special Products :: NPZ Optics Corp. Produces night vision and daylight goggles, binoculars, rangefinders, and astronomical telescopes. http://www.npzoptics.com

night vision device night vision devices NV NVD night vision binocular see at night law enforcement security military products manufacturer russian manufacturer night vision manufacturer night visions manufacturer russian russian night vision russian night visions nights night vision nite vision night visions nightvision generation generation 2 generation 2+ 2nd gen 2nd generation Gen 3 generation 3 GaAs scope scopes night vision goggles NVG illuminator infra-red IR IR illuminator illumination image intensifier intensifier tube multi coatings multilayer anti-reflection coatings waterproof waterproof design dry nitrogen focus adjustment eyeguard battery field of view magnification eye relief exit pupil NPZ Optics State Corporation (Novosibirsk Instrument Making Plant) are one of the leading Russian manufacturers of high-quality optical devices for military, law enforcement and civilian use, such as night vision goggles and binoculars, daylight and night vision sights (rifle scopes), range-finders, powerful binoculars and astronomical telescopes.

11. Www.telescope.com/jump.jsp?itemID=0 ItemType=HOME_PAGE More results from www.telescope.com Mead telescopes, telescopes, Microscopes, Meade telescopes, Mead Mead telescopes Specializing in telescopes, Microscopes, Meade telescopes, Mead Telescope, Optics, Digital Camera Binoculars, Simmons Optics, Weaver Optics http://www.telescope.com/jump.jsp?itemID=0&itemType=HOME_PAGE

12. 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.

13. Large Telescopes The World's Largest Optical telescopes. Operational. Aperture (meters PanSTARRS. Hawaii. Four separate telescopes; optimized for surveys; cheaper than LSST http://seds.lpl.arizona.edu/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 LZT British Columbia, Canada 49.28 N; 122.57 W Liquid mirror, points only at the zenith; UBC Hale Palomar Mountain, California

14. Meade Instruments Corporation - How Telescopes Work World s leading manufacturer of astronomical telescopes for the serious amateur astronomer. Products include Types of telescopes. All telescopes http://www.meade.com/support/telewrk.html

Home Sports Optics Home About Meade Product Information Dealer Referral Meade's Universe Customer Support Investor Relations Dealer Support Employment Opportunities Site Map Meade Instruments Corporation Customer Support What You Can See Through a Telescope The purpose of a telescope is not to magnify, as commonly thought, but to collect light no inherent effect whatever in determining the level of detail visible through a telescope. The planet Saturn. This image shows Saturn approximately as it appears under good atmospheric conditions through the Meade ETX telescope at a power of 100x. Example: Two telescopes, one with a main lens of 2" diameter (or aperture) and one with a main lens of 4" diameter are focused on the planet Jupiter. Both telescopes are set to use a power of 100 times (written as 100X). In the 2" telescope Jupiter's largest cloud belts are clearly observable; but in the 4" telescope the same cloud belts are seen to take on added structure and color, and smaller cloud belts are now visible that could not be discerned in the smaller instrument. It is the larger telescope's advantage in light-collecting capability that permits it to present more detail, more information, to the eye than is possible through the smaller telescope, irrespective of the powers employed on either instrument. Types of Telescopes All telescopes fall into one of three optical classes. The relative advantages of each of these telescope designs will be made clear below.

15. Dobsonian Telescope Obsession My other telescopes never performed well from my backyard. UPDATED 5/23/04. Obsession telescopes 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: Hundreds of 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 Collimation Instructions Learn the Barlowed Laser Technique for perfect primary mirror alignment We Helped Start Big Scope Fever: Obsession¨ FIRSTS Publications by or about Obsession:

16. Bausch & Lomb By Bushnell Bogen Bushnell Celestron Kenko Leica Meade Nikon Penta Online retailer of telescopes, binoculars, microscopes and accessories from numerous manufacturers. Located in California. http://www.discount-telescopes.com/

binoculars meade telescopes bushnell binoculars steiner binoculars opera glasses spotting scopes Bushnell binoculars meade telescopes nikon binoculars spotting scopes meade telescope spotting scope canon binoculars swarovski binoculars steiner binoculars swift binoculars leica binoculars pentax binoculars Zeiss binoculars Nikon binoculars Minox Binoculars meade binoculars meade telescope opera glasses laser range finder night vision binoculars tasco swift binoculars leica binoculars BUSHNELL celestron telescopes Bushnell telescopes kahles binoculars tasco binoculars CARSON ZOOM BINOCULARS Pentax Binoculars laser range finder celestron telescopes steiner optics laser range finders bausch Lomb binoculars swarovski binoculars bushnell telescopes canon binoculars bushnell telescope CELESTRON Nikon Binoculars Zeiss Binoculars Leica Binoculars Minox Binoculars Astroshops by Busnell Canon Binoculars Swarovski Binoculars Celestron Telescope Celestron Spotting Scopes Celestron Binoculars Celestron Microscopes Swift Binoculars Nikon Scopes Pentax Binoculars Meade Telescopes Kenko Scopes Astronomy Now Magazine Cambridge Institute of Astronomy Astronomy Picture of the Day Phil Plait's Bad Astronomy Astronomy.Net

17. Orbiting Astronomical Observatories Orbital telescopes. OAO2 was successfully launched on December 7, 1968, carried 11 UV telescopes, and was actively observing for years. http://www.seds.org/~spider/oaos/oaos.html

Orbital Telescopes Since the early years of spaceflight, the advantages of astronomical observing above the Earth's atmosphere were recognized, and led to the introduction of astronomical instruments on spacecraft, i.e., astronomical observatories in space (in most cases, in Earth's orbit). Please note that this list is not complete in specific Solar research satellites, and does not include planetary probes. Astronomical Satellites Launch Sequence Additions, corrections, and comments are welcome, please email me Our image shows Nasa's High Energy Astronomical Observatory (HEAO) 2 satellite, which was also named Einstein Ariel 1, 2, 3, 4, 5, and 6 (UK) The honor of the first astronomical satellite project goes to Great Britain. Ariel 1 , launched April 26, 1962, investigated Solar UV and X-radiation, and obtained an energy spectrum of primary cosmic rays. Ariel 2, 3, and 4 , launched March 27, 1964 (2), May 5, 1967 (3), and December 11, 1971, respectively, investigated astronomical objects in the radio range. Ariel 5 (launched October 15, 1974) and

18. Dobsonian Evolution A links page with images and short descriptions of compact, ultralight, and motorized Dobsonian telescopes. http://members.aol.com/radcash/compact.htm

my ATM Links Page (Please be patient while images load) Compact Designs: Tom Clark of Tectron Telescopes and Amateur Astronomy Magazine started this trend in the '80's. This is an 18-incher, ready for transport. Hawaiian astronomer K. Barry Peckham (extreme right) makes exquisite compact telescopes: Litebox Designs These two suitcases contain all the pieces for Jack Gelfand's 16" scope: Chuck Faytak of Erie, PA has crafted a fine scope. E-mail him for more pics! Kurt Maurer's scopes and home-built accessories (including equatorial platform). Don't neglect to check out his remake of an Astroscan into a "mini-Obsession," seen here at his knee. Tom Noe of Wylie, Texas handcrafts top-of-the-line compact telescopes of various sizes. Go to Linda Silas' Homepage (Tom's "significant other") to download a complete .pdf manual for one of his scopes (click on the "Graphic Design" button and scroll down to "Technical Manuals and Brochures"you'll see the images at the left). David North's two-tube 12.5-incher

19. Telescopes.com telescopes.com Serving customers since 1987, we are your source for telescopes, Binoculars, Eyepieces and more. At telescopes.com we stand behind our service and the products that we carry. We http://rdre1.inktomi.com/click?u=http://inkt.reporting-center.com/track1.htm?pid

20. Welcome To The Public Entrance Of The Gemini Observatory The Gemini Project is an international partnership that will result in two 8. 1meter telescopes (each telescope has a main mirror over 26 feet across. ) one telescope is located on Hawaii's Mauna Kea, and the other on Chile's Cerro Pach³n. http://www.gemini.edu/public/

Gemini North, Mauna Kea, Hawai'i Gemini South Dedication Page Gemini North Dedication Page Virtual Tour of Gemini North Current Picture of the Enclosure The Gemini Observatory is an international partnership comprised of two 8.1-meter telescopes (each telescope has a main mirror over 26 feet across.) One telescope is located on Hawaii's Mauna Kea , and the other on . The name Gemini comes from the mythological twins, whose stars are visible to both telescopes. United States of America United Kingdom Canada Chile Australia Argentina Brazil The flags above represent all of the countries that have joined the Gemini partnership. Astronomers in each country are allotted observing time in proportion to their country's contribution. Star Trails at Gemini (Photo courtesy Richard Wainscoat) By building the telescopes on Mauna Kea (elevation 13,824 ft/4214 m) in Hawai'i and Cerro Pachón (elevation 8895 ft/2737 m) in central Chile, both the northern and southern skies are fully accessible to these scopes. Both sites also offer high percentages of clear weather and excellent atmospheric conditions for all types of astronomical studies. Take a look at a " real-time " image of Gemini North!

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