81. Gemini Observatory: Exploring The Universe From Both Hemispheres Mauna Kea, Hawaii, and Cerro Pacha, Chile. Features news, information about the facilities and telescopes, web cams, and resources. http://www.gemini.edu/

var javascript_version = 1.0; About Gemini Partners FTP Site Jobs ... Contact Us Publications Based On Gemini Data Patches for Gemini IRAF package v1.7 and v1.8 NICI Planet Search Campaign Call for Proposals released PI electronic data distribution bHROS web pages available ... AURA Announces Formation of the Gemini Director Search Committee The Association of Universities for Research in Astronomy (AURA) seeks a new Director for the Gemini Observatory, with the aim of filling this position in early 2006. Gemini to continue full support and development of its IRAF data reduction package Aspen Report available for download Future Science at Gemini New Horizons, New Science, New Tools Learn more about Gemini's plans for the middle of this decade and beyond Current Call for Proposals Proposal Process: Phase I Phase II Software: Phase I Tool (PIT) Observing Tool (OT) Weather and Site Information: Gemini North Gemini South Availability and Performance Statistics Telescope and Site Information ... Gemini IRAF Package Gemini North: Altair GCAL GMOS-North GPOL ... NIRI Gemini South: Acquisition Camera bHROS GCAL GMOS-South ... Governance Oversight, Support and Planning

82. MakScopes Maksutov Cassegrain and Maksutov Newtonian telescopes by owners. http://www.lafterhall.com/makscopes.html

MakScopes Web site home of the MakScopes E-mail discussion group. Join the list at: http://www.onelist.com/group/MakScopes MAKSUTOV TELESCOPE REVIEWS by MakScopes members INTES-MICRO ALTER 603 MAKSUTOV-CASSEGRAIN Reviewed by Cor Berrevoets of Ritthem, The Netherlands Cor uses his M603 for all around observing including double stars, deep sky, solar, lunar and planetary, plus, he uses the M603 for astrophotography. INTES-MICRO ALTER 603 MAKSUTOV-CASSEGRAIN Reviewed by Jim Ferreira, San Francisco bay area, California, USA ferreira1@llnl.gov http://www.lafterhall.com Jim's M603 is used almost exclusively for solar, lunar and planetary video capture astrophotography. INTES MK-66 MAKSUTOV-CASSEGRAIN Reviewed by Milton Esquinaldo INTES-MICRO MN-56 MAKSUTOV-NEWTONIAN Reviewed by Milton Esquinaldo RUNIBAR 10cm f/10 MAKSUTOV-CASSEGRAIN Michael Boschat, Halifax, Canada mboschat@ns.sympatico.ca http://www.mscs.dal.ca/~andromed INTES MK-91 MAKSUTOV-CASSEGRAIN Reviewed by Peter Zimmer INTES-MICRO MN-76 MAKSUTOV-NEWTONIAN Chuck Lane clane47@bellsouth.net

83. Radio Telescopes telescopes observing at these wavelengths are commonly called radio telescopes.Although they do not look like optical telescopes, radio telescopes are http://csep10.phys.utk.edu/astr162/lect/light/radio.html

Radio Telescopes Most of what we know about the Universe comes from information that has been carried to us by light. But we have seen that visible light is only a small part of the electromagnetic spectrum. In recent years the remainder of the electromagnetic spectrum has revealed extensive information about our Universe. NRAO 140 Foot Telescope The first non-visual spectral region that was used extensively for astronomical observations was the radio frequency band. Telescopes observing at these wavelengths are commonly called radio telescopes . Although they do not look like optical telescopes, radio telescopes are built to accomplish the same gathering and focussing tasks on radio frequency radiation that reflecting telescopes perform on visual frequency light. The adjacent image shows the 140 foot antenna of the National Radio Astronomy Observatory in Green Bank, West Virginia. Radio telescopes are used for many purposes, but let us describe two here explicitly: the mapping of neutral hydrogen concentrations using the 21 centimeter spin-flip transition in hydrogen, and the use of multiple radio telescopes operated as if they were a single telescope of very high resolution. Mapping Neutral Hydrogen A neutral hydrogen atom (H I) consists of 1 proton and 1 electron. The proton and electron spin like tops with their spin axes either parallel or anti-parallel. When hydrogen atoms switch from the parallel to the anti-parallel configuration they emit radio waves with a wavelength of 21 centimeters and a corresponding frequency of exactly 1420 MHz. This is called the

84. ITE - Classifieds Listings of telescopes and accessories for sale or trade. http://www.iteastronomy.com/classifieds/

Intes Micro MN76 7" F/6 Maksutov-Newtonian OTA (Limited time offer- MN76 deluxe, special coatings, cost reduced) For more info on ITE and our products, contact us ; call us at 800.699.0906 or 561.282.3222; or email mike@ITEastronomy.com site by Scully Interactive ITE's Telescopes Choosing a Telescope Mid Range ... Software and Books

85. Reflecting Telescopes Reflecting telescopes For technical reasons, the largest optical telescopesare reflecting rather than refracting telescopes it is easier to build and http://csep10.phys.utk.edu/astr162/lect/light/reflecting.html

Reflecting Telescopes In the preceding section we saw how to use refraction by lenses to design a telescope. We may also use reflection from mirrors to accomplish the same purpose. The Principle of Reflection The following figure illustrates the principle of reflection: the angle of incidence (measured from the perpendicular to the reflecting surface) is equal to the angle of reflection. The right side of the figure illustrates the use of a mirror to make a reflecting telescope. Principle of reflection and the reflecting telescope Here is a Java applet illustrating the use of a mirror (a diverging or convex mirror in this case) to form an image. For technical reasons, the largest optical telescopes are reflecting rather than refracting telescopes: it is easier to build and support large mirrors of high optical quality than large lenses. Focus for Reflecting Telescopes One problem that must be surmounted with a reflecting telescope is how to place an observer at the focus. In the example shown above, the focus is inside the telescope. This is called the prime focus , and in some large telescopes observations can be made at the prime focus. More commonly, various mirror arrangements are used to transport the light from the focus to an external observer. Two common ones are a

86. BirdScope Information about birding with Tele Vue telescopes, with telescope and accessory selection guides, specifications, reviews, usage notes, and dealer list. http://www.televue.com/birdscope/

Welcome To Birdscope.com Homepage for Birding Oriented Tele Vue Scopes Rated World's Finest Birding Optics Winning Combo for Birders: TV-76 APO telescope with Tele Vue 13mm Nagler Type-6 wide-field eyepiece and 60° diagonal. Table of Contents Choosing the Right Tele Vue Telescope For Your Lifestyle Recommended accessories Photography and imaging with scopes Reviews ... Dealers, worldwide New Tele Vue-60 New perfectly portable (body only 10" long) TV-60 APO shown with optional 60° diagonal and 1¼" eyepiece. Tele Vue has been producing telescopes for terrestrial and astronomical use since 1985. From the lightweight, 60mm-aperture Tele Vue 60 APO model to the Tele Vue 85 APO rated tops for optics by the Cornell Ornithology Lab you'll find rugged USA built quality along with versatility and optical excellence. In addition to the widest-angle views of any spotting scopes, and the photographic capabilities when used as fast telephoto lenses, every Tele Vue telescope is tested to perform to the theoretical ideal for high power observations. Your long-distance "microscope" for feather structure at 150x can also become your passport to the moon, planets, and stars. Check over the reviews, specs and customer comments and call a Tele Vue dealer or our office in Chester, NY at 845-469-4551 for any questions you may have. "Dare to be different" and reap the rewards of visual experiences never imagined!

87. Binoculars.com - Summer Specials On Binoculars, Telescopes, Spotting Scopes Offers a selection of optics including binoculars, telescopes, and nightvision. http://www.binoculars.com/

Home Binoculars Telescopes Spotting Scopes ... Closeouts Browse Brands Acitpo Optica Advanced Telescope Systems Aimpoint Alpen Apogee Inc Astro Engineering AstroZap ATN Audubon Barska Beam of Light Technologies Binoculars.com Bogen/Manfrotto Browning Brunton BSA Optics Burris Bushnell Canon Carson Optical Celestron Coronado Cosmo Comfort Crimson Trace Discovery Telescopes Droll Yankees Eagle Optics Fujinon Galileo Garmin Gitzo GSCI Hardin Optical Hotech Green Laser ITT Jim's Mobile (JMI) Kahles Kendrick Konus Kowa La Crosse Technology LaserMax Leica Leupold Riflescopes Leupold Sports Optics Losmandy Lumicon MAGPIX Masterpiece Collection Meade Minolta Minox Miyauchi Morovision N )Vision National Geographic Newcon Night Detective Night Owl Nikon NovaBird Oberwerk Olympus Op/Tech USA Optavian Oregon Scientific Orion Peet Bros. Pentax Radian Raytheon Redfield Rigel Optics SAC Imaging Systems SanDisk Schmidt Bender ScopeTronix Simmons Software Bisque SolarScope Sportbinox Sportoculars Sportscope Starry Night Software Steiner Streamlight Swarovski Swift Instruments Takahashi Tasco Telescopes.com TeleVue Telrad Toshiba US Night Vision Velbon Vero Vellini Vixen Vortex Weaver William Optics X-Optics Yukon Zeiss Zhumell Advanced Since 1994 myAccount myComparisons myCart Contact ... Steiner 8x30 Military-Marine Military-Marine View Details Purchase Now Add to Comparison Chart Steiner 7x50 Observer w/Compass n/a

88. TScopes.com - Affordable Quality Produces Dobsonian telescopes in a variety of sizes. The company s FarStartelescope claims to be the lightest weight 18 Dobsonian telescope available from http://www.tscopes.com/

The 14" TScope DobParts.com BigDobs.com Tscope Quality: It's in the mirrors, it's in the construction, it's in the motion, it's in the views. News: 2005 StarParty Schedule is here Tscopes feature certified secondaries from Antares Optics ... $3975 complete!!! [ more info Tscope Ultralights start at just $2275 Got aperture fever? A 14" Tscope is an excellent step up from your 10" or smaller scope. They are designed to weigh less (and cost less!) than other telescopes this size. Easy to move and set up; get big telescope views without big telescope hassles. TM This well-built 14" Dob has wave optics standard and is offered at a low price... T Scopes are built to last a lifetime: Weatherproof glues and finishes, strong multi-ply plywood, anodized aluminum and stainless steel parts all come together in the creation of this lightweight, highly-portable telescope frame. Add a high quality 14" f4.7 primary and a minimally obstructing 2.6" secondary and you have a telescope superior for both planetary and deep sky viewing Click for more info.

89. Homepage The resource website for the LX200, LX90, LX50, LXD55, Starfinder, and ETX telescopes, and Pictor CCD cameras and imaging software. http://www.mapug.com/

Mapug has moved to http://www.mapug-astronomy.net/

90. Takahashi America Suppliers of Takahashi telescopes, Swarovski binoculars and CCD cameras.Also suppliers of such names as Meade and Celestron telescopes and Leica and Zeiss http://www.takahashiamerica.com/

Top Catalog My Account Cart Contents ... Checkout Categories Clocks Optics Cleaning Supplies Quick Find Use keywords to find the product you are looking for. Advanced Search Takahashi Dealer List Image Gallery System Charts FAQ ... Contact Us Welcome to Takahashi America Welcome Guest! Would you like to log yourself in ? Or would you prefer to create an account is the retail division of Texas Nautical Repair Inc. Founded in 1940 to serve the vessels that call upon the upper Texas Coast, Texas Nautical Repair Company Texas Nautical had become the supplier of hard to find optical and scientific products for much of the Gulf Coast region. Universities, schools, laboratories, clinics, observatories and refineries are among the many customers who rely on the professional knowledge of the specialists at to get the instruments they need. We have accounts with several government agencies including the National Aeronautics and Space Administration (NASA). In 1983, Texas Nautical Repair Inc. became the exclusive importer and distributor for Takahashi Seisakusho Ltd. in the Americas. Renown for their exquisite workmanship and performance, Takahashi telescopes and astrographs are considered some of the finest in the world. Today; is dedicated to providing complete customer service for those who are looking for more than just an optical instrument. Many companies can sell a product. The raison detre for

91. MAST DSS Comprises a set of allsky photographic surveys in E, V, J, R, and N bands conducted with the Palomar, and UK Schmidt telescopes at the Space Telescope Science Institute. http://stdatu.stsci.edu/dss/

Skip to Main Content DSS Digitized Sky Survey Cross-mission Mission-specific Quick search Aladin ... STScI Searches-Tools Missions Tutorial Site Search DSS Home About DSS ... Data Use Policy The Digitized Sky Survey comprises a set of all-sky photographic surveys in E, V, J, R, and N bands conducted with the Palomar and UK Schmidt telescopes. The Catalogs and Surveys Branch (CASB) is digitizing the photographic plates to support HST observing programs but also as a service to the astronomical community. The 6.5-degree x 6.5-degree plates are scanned using a modified PDS microdensitometer to a pixel scale of about 1.7 arcseconds per pixel for the POSS, SERC, and Palomar Quick-V surveys, and to about 1.0 arcseconds per pixel for the POSS-II surveys. Images of any part of the sky may be extracted from the DSS, in either FITS or GIF format. NEWS August 08, 2005: MAST Annual Report online August 04, 2005: MAST Image Data now Searchable using Aladin April 18, 2005: MAST Newsletter March 23, 2005: 2MASS Images Accessible from MAST Scrapbook March 16, 2005:

92. Radio Telescopes Details of Radio telescopes around the world. One of the world s leadingradio telescopes. It consists of 27 aerials (antennas) arranged in a huge Y http://www.r-clarke.org.uk/astrolinks_radio.htm

Astronomy MegaLinks Radio Telescopes To add new, or missing, links, report outdated ones, or change your details to this page click here. Click below to go to another section Optical Observatories Radio Telescopes Space Facilities Institutes ... Site Map Jodrell Bank Principal Radio Telescopes Arecibo Radio Telescope Puerto Rico. The world's largest single radio telescope. Arizona Radio Observatory Arizona Radio Observatory/Steward Observatory/University of Arizona 12m telescope, Tucson, USA. Atacama Large Millimetre Array ALMA is a millimetre wavelength 64 antenna telescope located in the Chilean Andes ATNF - Australia Telescope National Facility The Compact Array at Park Wild Observatory, Narrabri. Big Ear Closed down in 1998. It was famous for discovering some of the most distant known objects in the Universe, and the longest-running SETI project. Website still active. Caltech Sub Millimetre Observatory Mauna Kea. 10.4m Leighton dish near the summit.

93. Slot Cars And HO From North Coast Features slot cars, models, rockets, games, radio control, telescopes, die cast and other hobby items. http://www.ncphobbies.com

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94. Telescopes This set of notes by Nick Strobel covers the basics of telescopes and effects of This is why the early refracting telescopes were made very long. b) http://www.maa.mhn.de/Scholar/telescopes.html

Telescopes This set of notes by Nick Strobel covers: the basics of telescopes and effects of the atmosphere on images. Vocabulary terms are italicized. Contents Types of telescopes Definition of telescope. Refractor Reflector Powers of a telecope Light Gathering Power ... Atmospheric lines Types of Telescopes Index Telescopes instruments used to gather and focus light. Visible and large parts of radio spectrum can be observed anywhere on ground; small parts of infrared (IR) must be observed above water layer in atmosphere (elevations of 2750 m (9000 ft) or above); gamma-rays, X-rays, UV, most IR, and rest of radio must be observed in space. The part collecting the light is called the objective. Refracting Telescopes Index Refractor use lens to bend light. First ones built. Disadvantages: a) Chromatic Aberration redder colors bent less than blue colors so see rainbow of colors around the image. Use multiple compensating lenses to counteract this OR have really long objective focal length to minimize effect (see drawing). This is why the early refracting telescopes were made very long. b) Support for lens only at ends of lens. Tends to sag under own weight. 40 inches is maximum size of refracting objective built. Reflecting Telescopes Index Reflector use mirror to reflect light. All modern research ones are this type. Advantages: a) No chromatic aberration. b) Support for objective all along one side so they can be BIG! Parabollic-shaped mirror focuses all parallel light rays to single point (remember that celestial objects are so far away that all the light rays from an object hit the Earth as parallel rays). Focus is before the eyepiece, so the image in astronomical telescopes (even with the refractor above) is upside down. Terrestrial-viewing telescopes use other lenses to re-invert the image right-side up.

95. The Science Company Sells a selection of weather instruments, microscopes, telescopes, GPS and related accessories. http://www.sciencecompany.com

*Call 800-372-6726 *Which is easier to install? *Can I see Bacteria with it? *What accessories should I consider? *Will it work in my car? *Who are we? *Shipping / tracking *Feedback - Listening to you *Call 800-372-6726 Shop Online Gift Ideas Customer Service Ask Your Advisor ... Home

96. Starmaster Portable Telescopes StarMaster Portable telescopes. Starmaster has a New Website! Visitwww.starmastertelescopes.com Win a $10000 Total Eclipse Cruise (April 2005) for Two! http://www.icstars.com/starmaster/

Starmaster has a New Website! Visit www.starmastertelescopes.com Win a $10,000 Total Eclipse Cruise (April 2005) for Two!

97. The Solar System A project by Grade 4 students explains about planets, comets and asteroids. Illustrated with diagrams, animation and photographs from space telescopes. http://www.germantown.k12.il.us/solarsystem/solsysa.html

98. Magellan Project to construct two 6.5 Meter optical telescopes in the southern hemisphere.The telescopes are located at Las Campanas Observatory, at an altitude of 8000 http://www.ociw.edu/magellan/

Home Search About Us Research ... Instrumentation Magellan Project Two 6.5 Meter Telescopes at Las Campanas Observatory The telescope enclosure for Magellan I, eclipsing the housing for Magellan II, still under construction, November 2000. The Magellan Project a collaboration between the Observatories of the Carnegie Institution of Washington (OCIW), University of Arizona, Harvard University, University of Michigan, and Massachusetts Institute of Technology (MIT) to construct two 6.5 Meter optical telescopes in the southern hemisphere. The telescopes are located at Las Campanas Observatory, at an altitude of 8000 feet in the Chilean Andes, and operated by OCIW. First light for the Walter Baade telescope occurred on September 15, 2000. The Landon Clay telescope started science operations on September 7, 2002. Observer Information Both the Walter Baade and Landon Clay telescopes are in operation. Telescope Schedule Telescope Instruments Instrument Setup Request Forms More complete information for observers can be found on the Magellan Operations Page page.

99. Antique Brass Microscope, Scientific Instruments, Microscopes, Mechanical Calcul Retails antique brass microscopes, telescopes, surveying equipment, calculating devices and other apparatus. http://www.scientiques.com/

Next Update Sep 2005 Antique scientific instruments, antique microscopes, calculators, engineering models and laboratory apparatus. The Artifice Domain is - www.scientiques.com Antique Scientific Instruments Sections hold the mouse pointer over a box to see contents For All enquiries contact Artifice Antique Scientific Instruments Telephone: + 0033 251 005929

100. Optical Guidance Systems Telescopes OGS manufactures custom telescopes and research grade telescopes for professionaland amateur astronomers. OGS is a dealer for Takahashi telescopes. http://www.opticalguidancesystems.com/

The World's Finest Line of Ritchey-Chretien Telescopes Optical Guidance Systems Optical Guidance Systems would like to announce the RC40-190FS, which is our 1-meter-class f/8 Ritchey-Chretien OTA interfaced with our OGS190 PC/TCS servo-driven computer controlled fork mount system. The RC40 is a 1-meter-class version of our time-tested Ritchey-Chretien optical tube assembly, which for the last 18 years, we have manufactured in the 10-32" range. NEW OGS RC20-140F scripts remotely with the integration of our ASCOM compliant operating system. Pre-Owned Instruments, referbished with new warrenties. RC24-140FN with dome and integrated dome control. 100% Turnkey system! RC12.5 Refurbished OTA with Robofocus SOLD! 2005 Images: By Jim Misti and Robert Gendler HelixwideJM See Jim Misti's OGS 32" RC on an OGS 140GN See Dr. Gendler's RC12.5 Optical Guidance Systems Telsecope NEWS ARCHIVE NEW OGS Magnesium RC12.5" Optical Tube Assemblies offer

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