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	Meade Instruments Corporation - How Telescopes Work
		Altazimuth Mountings: The simplest type of telescope mount allows the telescope to be moved up-and-down (in vertical, or altitude) and left-to-right (in horizontal, or azimuth).
		The altazimuth mount, owing to its simplicity and relatively lower cost, is widely used with telescopes in both land-viewing and astronomical applications.
		Equatorial Mountings: Although celestial objects are essentially fixed in their positions in the sky (on the celestial sphere, the imaginary spherical surface on which all astronomical objects are located), they appear to move in an arc across the sky, as the earth rotates underneath the sky once every 24 hours.
	www.meade.com /support/telewrk.html (1750 words)

	altazimuth mounting
		A telescope mounting, also known as an alt-azimuth mount, that allows up and down pivoting (changes in altitude, or elevation, from 0° to 90°) together with horizontal rotation (changes in azimuth by ± 180°).
		Drawbacks, in addition to dual-axis tracking, are that the tracking rate varies with position in the sky and that the field of view rotates, which, though not a problem for point sources such as stars, must be addressed for any extended source by either rotating the instrument or by de-rotating the image.
		A popular version of the alt-azimuth mount used widely by amateur astronomers is the Dobsonian.
	www.daviddarling.info /encyclopedia/A/altazimuth_mounting.html (0 words)

	Computerized Alt/Az
		The head was attached to a permanently mounted pier that that was sunk in 2 feet of concrete.
		However, the mount lacked slow motion controls and so it could be extremely frustrating to first precisely center an object, say in the tiny field of view (FOV) of a small CCD chip.
		On the positive side, this mount is one of the most steady and stable that I've ever used.
	www.unm.edu /~abqtom/computerized_alt-az_mount.htm (1674 words)

	Celestron -- Telescope Basics
		Certain altazimuth mounts are now computer driven and allow a telescope to track the sky accurately enough for visual use but not for long exposure photography.
		A telescope on an equatorial mount can be aimed at a celestial object and easily guided either by manual slow-motion controls or by an electric clock drive to follow the object easily across the sky and keep it in the view of the telescope.
		The wedge is mounted between the bottom of the fork mount and the tripod.
	www.celestron.com /tb-mtrms.htm (854 words)

	Highbeam Encyclopedia - Search Results for altazimuth
		altazimuth (astron.) instrument for determining the altitude and azimuth.
		It is the angular distance of a body measured westward along the celestial horizon from the observer's south point.
		In the altazimuth coordinate system the altitude of a body is measured along its vertical circle.
	www.encyclopedia.com /SearchResults.aspx?Q=altazimuth&StartAt=1 (447 words)

	The telescope mounts and drives
		For small telescopes and more powerful types of binoculars, the altazimuth mount is commonly used.
		The altazimuth mount is fine for low-power, wide-field work, but it becomes increasingly difficult to keep objects inside the narrow field of view of a large telescope, and both axes of the mount require constant adjustment.
		The mount must be perfectly level and the polar axis aimed at the celestial pole.
	library.thinkquest.org /21008/data/sky/telescope_mounts.html (481 words)

	John Pierce's Telescope Making Articles. (Site not responding. Last check: )
		To sum up, the equatorial mount differs from the altazimuth mount by having one axis, named the polar axis, parallel to the Earth's axis; while the other axis, called the declination axis, is at right angles to the polar axis.
		In this mount the telescope is hung at one side of the polar axis, and balanced by the counterweight on the other end of the declination axis.
		In this mount the telescope is hung on trunnions in the fork with its center of gravity at the point where the center lines in balance in all positions without any counterweight.
	bobmay.astronomy.net /johnpierce/part3.htm (2309 words)

	Astronomical Society of Nevada (Site not responding. Last check: )
		The common mounts are the "Equatorial" and the "Altazimuth".
		The equatorial mount requires alignment with the celestial pole to operate satisfactorily and is thus not recommended for someone who is brand new to astronomy and not yet familiar with the sky.
		The Dobsonian mount is an altazimuth mount that normally sits on the ground without a tripod under it.
	astronomynv.org /index.php?firstscope (1354 words)

	The telescope mounts and drives
		For small telescopes and more powerful types of binoculars, the altazimuth mount is commonly used.
		The altazimuth mount is fine for low-power, wide-field work, but it becomes increasingly difficult to keep objects inside the narrow field of view of a large telescope, and both axes of the mount require constant adjustment.
		The mount must be perfectly level and the polar axis aimed at the celestial pole.
	library.advanced.org /21008/data/sky/telescope_mounts.html (481 words)

	Dan's Camera City: A Guide to Telescopes
		The altazimuth mount is more economical and is adjustable for altitude (up and down) and azimuth (left and right) to achieve a full range of motion.
		By aligning the mount relative to the Earth's rotation, the controls on an equatorial mount allow you to easily follow an object and keep it in the field of view.
		If your mount has a level built in, you're all set, just adjust your tripod until the bubble in the level is right in the middle of the bulls-eye.
	www.danscamera.com /Learning/telescopes (666 words)

	Telescope Mounts (Site not responding. Last check: )
		Some altazimuth mounts are equipped with slow-motion controls, which allow fine adjustment of the telescope's aim to help zero in on target objects.
		One new version of altazimuth mount used widely by amateur astronomers is called the Dobsonian mount.
		Also, with better equatorial mounts, astronomical objects can be located by their celestial coordinates (found in observing guides and star atlases) using the RA and Dec setting circles.
	www.actonastro.com /mounts.htm (298 words)

	Re: How does a rotator help an alt/azmth telescope take images?
		The altazimuth mount is one in which the telescope can rotate around the vertical axis or move from horizon to zenith (directly overhead).
		The altazimuth mount is simpler and cheaper but runs into problems when trying to take astrophotographs which may require lengthy exposures.
		During long exposures with an altazimuth mounted telescope, even if the telescope is perfectly pointed, the stars in the outer portion of the field of view appear to rotate around the field.
	www.madsci.org /posts/archives/jan2001/979087084.As.r.html (363 words)

	Basic Telescopes
		While the altitude axis of an altazimuth mount may bend, the bending is constant and can be compensated by realignment of the tube or optics.
		This is not the case with an altazimuth mount.
		Thus instruments on an altazimuth mounted telescope must be mounted on a bearing which must be rotated at the correct rate to compensate for field rotation.
	www.astro.ufl.edu /~oliver/ast3722/lectures/BasicScopes/BasicScopes.htm (990 words)

	Telescope Mounts - an Astronomy Net Article (Site not responding. Last check: )
		An altazimuth mount is a design to hold the OTA and allow the user to guide the scope by using two motions.
		The gimmick of this mount is the telescope is aligned along an axis that runs parallel to the earth's spin.
		Refractors mounted on tripods can be comfortable to use while sitting in a chair if the object you are viewing is not near the horizon or zenith.
	www.astronomy.net /articles/25 (2449 words)

	Computer controlled altazimuth telescope mount - Patent 4764881
		The mount is initially oriented by pointing the telescope at a reference location in the sky such as a known star and inputting its coordinates to a microprocessor-based control system.
		One well known type is referred to as an "equatorial mount" which includes a rotatable polar shaft, a stationary support for the polar shaft, a rotatable declination shaft which is secured to the telescope, and a member which is secured to the polar shaft and which rotatably supports the declination shaft.
		In use, the polar shaft is positioned with its axis in the direction of the north star, and the telescope is initially fixed on a target star, planet or moon by rotating it on the shaft axes to a certain position.
	www.freepatentsonline.com /4764881.html (5283 words)

	Telescope FAQ - Page 2
		The trade-off is that they are mounted on altazimuth mounts, instead of equatorial ones, which makes them essentially useless for astrophotography, but an inexpensive alternative if you only plan to do visual work.
		Equatorial mounts are virtually essential if you intend to do astrophotography, but are also much more expensive than the dobsonian or other altazamuth types.
		A fork mount is a type of mount where the telescope is held by two arms, and swings between them.
	www.pha.jhu.edu /~ggaspar/physics/telescopes.html (2824 words)

	Telescope Mounts and Tripods - Orion Telecopes & Binoculars
		Telescope mounts come in two general types: altitude-azimuth (or altazimuth) and equatorial.The simplest type of mount is the altazimuth version.
		Standard camera tripods have altazimuth mounts.Because they are easy to use and cost less than equatorial mounts, altazimuth mounts are ideal for smaller, inexpensive, beginner telescopes.
		Some altazimuth mounts are equipped with slow-motion controls, which allow fine adjustment of the telescope's aim to help zero in on target objects.One new version of altazimuth mount used widely by amateur astronomers is called the Dobsonian mount.
	www.telescope.com /sdx/H3191.jsp (317 words)

	Planetarium.Net Telescope Buying Guide: Mounts
		One popular type of altazimuth mount is known as the Dobsonian.
		Dobsonian mounts are usually found on medium or large size reflecting telescopes.
		Equatorial mounts are often configured with motorized drives which match the rotation of the Earth.
	www.planetarium.net /edcenter/scope/mounts.htm (275 words)

	Night Sky- Choosing and Using Your First Telescope - AOL Research & Learn
		Altazimuth is a fancy term denoting a simple up-down, left-right type of mount.
		One variation of an altazimuth mount that you’ll see often on these pages but rarely on a showroom floor is called a Dobsonian.
		Equatorial mounts were common in the days before the advent of microprocessors to control the complex motorized motions needed to have an altazimuth mount track the sky, and they’re still convenient for viewing (especially at high power) when you have to move a scope manually.
	reference.aol.com /space/nightsky/_a/choosing-and-using-your-first-telescope/20051122122209990001 (1630 words)

	WHT - The Mounting (Site not responding. Last check: )
		The altazimuth design of the telescope means that the field of view rotates as the telescope tracks.
		In order to compensate for this, it is possible either to mount instruments on a turntable or to place image derotation optics in the beam.
		The former option is used at the Cassegrain and prime foci, but at Nasmyth, only light instruments may be mounted directly on the turntables and heavy apparatus, which must be kept stationary, is used with image derotators.
	www.ing.iac.es /PR/wht_info/whtmounting.html (345 words)

	SPACE.com -- a series of stories on how to buy a telescope
		Altazimuth mounts are easy to operate and less costly than equatorial mounts, and also are great for kids.
		It qualifies as an altazimuth mount when its axes are oriented toward the horizon (altitude and azimuth motion).
		The advantage in having an equatorial mount is that you can attach a motor, or clock drive (see below), to the polar axis and automatically track the stars as they drift across the sky.
	www.space.com /scienceastronomy/astronomy/telescopes_IV.html (1863 words)

	History and Development of the Telescope
		dobsonian mount is a type of altazimuth mount which has proven to be very popular as it is simple and cheap to make.
		Modern large telescopes use computer-controlled altazimuth mounts, and for long exposures they rotate the instruments or have variable-rate image rotators in an image of the telescope pupil.
		The mounting is also unique, an equatorial mount that is not a fork, yet permits the telescope to image near the north celestial pole.
	www.edinformatics.com /inventions_inventors/telescope.htm (1208 words)

	Astronomy 101 - A is also for Altitude and Azimuth (Site not responding. Last check: )
		Serious amateur astronomers used to consider the ALTAZIMUTH mount to be generally inferior to the EQUATORIAL mount because the equatorial mount easily "tracks" an object under study by moving in only one axis while the altazimuth mount requires constant movement in both axes.
		However, the advantage of the altazimuth mount over the equatorial mount is its great rigidity.
		Two fairly recent developments began changing the prejudice against the altazimuth mount: the appearance of relatively inexpensive computer controlled drive motors and the development of very large Dobsonian (a form of altazimuth) mounted telescopes with apertures of from 20 to 30+ inches.
	www.astras-stargate.com /astronomy101.html (223 words)

	Telescope Mountings and Tripods
		As it is not possible to screw the mounting bolt on top of a pier into the base of LX200/GPS telescopes, this simple and robust adaptor barrel will enable you to mount the instrument on top of the Owl's Nest and still screw a fixing bolt into the base of the telescope.
		The mounting is fitted to a variable-height fl hardwood tripod (fully adjustable from a minimum height of 91cm [36”] to a maximum height of 140cm [55”]).
		The CNC manufactured mini-dovetail telescope mounting plate has been specifically designed to fit the base of the Coronado Personal Solar Telescope, but can be used with a wide variety of small telescopes provided that they have a 1/4” Whitworth tripod fitting.
	www.astro-engineering.com /Mountings/telescopemountin.html (2019 words)

	CoSaTrak - Electronics and Software overview (Site not responding. Last check: )
		Once the mount has locked onto the satellite and is busy tracking, the arrow keys can be used to move it into the centre of the telescope field.
		Since altazimuth telescope mounts usually have a limit in their ability to track high elevation passes through culmination, especially at near-zenith transits because of the large azimuth swings required, the mount can start falling behind.
		The speed requirements of the predictions are constantly calculated and if found to exceed the mount's limits, tracking is temporarily suspended and the mount automatically slewed ahead to the first prediction that is within the capabilities of the mount again.
	www.saao.ac.za /~wpk/CoSaTrak/willie.html (2450 words)

	Bill Keel's Telescope Life List - Bolshoi Teleskop Azimultanyi
		The first really large optical telescope to incorporate an altazimuth mount (and thus requiring constant computer control to operate), it is located on the slopes of Mount Pastukhov on the northern side of the Caucasus range, between the Black and Caspian Seas.
		The BTA itself is an altazimuth reflector whose Ritchey- Chretien optics have a primary focal ratio of f/4.
		An outstanding characteristic of the BTA is its altazimuth mounting (as on a theodolite), allowing it to point at any desired area of the sky, pivoting about vertical and horizontal axes.
	www.astr.ua.edu /keel/telescopes/bta.html (3860 words)

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