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Topic: Setting circles

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	Big Dipper map
		Declination is the up and down setting circle of the scope and is generally not calibrated to the reference star provided it is accurately adjusted (consult your telescope's manual).
		If the Dec circle reads differently from the reference stars coordinate, then set this circle to match it or make not of its deviation and add or subtract this amount from the desired object's Dec. This second method is the most accurate and should get you within an eyepiece view width of the desired object.
		Set your circles to the coordinates for Alkaid: RA 13:47.5, and Dec.
	webhome.idirect.com /~rsnow/bdipper.html (1445 words)

	How to Find M104
		The main complaint with setting circles is that your scope must be perfectly polar aligned in order to obtain any degree of accuracy (which will still vary as you move across the sky).
		If your circle is reading +1 or -1 degree from the star's co-ordinate, compensate by that amount when you move the scope to the new co-ordinates of M104 (don't adjust the Dec. setting circle as you did the RA.
		If you set up the circles properly, are close to polar alignment, and had centred your scope on the right bright star, you should now be looking at M104 or are very close to it.
	webhome.idirect.com /~rsnow/m104.html (790 words)

	Astronomical "How to" Tips - Setting Circles
		Though I had become very knowledgeable about wedge, clock drive, setting circles, polar alignment, etc., I was rather intimidated by their use and simply used the C5 as a sort of Dobson, alt-az, plunking it down somewhere and avidly tracking down and observing scores of galaxies, clusters, etc.
		Setting circles, then, are not part of an excluding, either/or debate.
		If anyone is interested in putting his or her setting circles to good use, please let me know and I can send you a copy, or further detailed instructions.
	calgary.rasc.ca /scircles.htm (2146 words)

	Build Your Own Digital Setting Circles (Site not responding. Last check: 2007-10-13)
		Setting circles on an astronomical telescope are used as an aid to pointing the telescope at a particular object in the sky based upon the object's celestial coordinates.
		However, setting circles can be difficult to use effectively and are usually not precise enough for putting objects in the telescope's field of view.
		Digital setting circles, on the other hand, can be made to be much more precise and fairly easy to use, making it relatively simple to find faint fuzzies in the sky without lots of star hopping.
	home.earthlink.net /~david.ek/digicircles/dsc.html (2567 words)

	Telescope Observer’s Guide
		Digital setting circles are either small computers that are connected to your telescope or a software program that runs on a personal computer along with a device that attaches to your telescope.
		Setting circles can be temperamental, they are not always able to accurately determine the telescope’s position, so some manual repositioning may be needed.
		Also setting circles can not compensate for clouds or the fact that many objects are visible at certain times of the year and not visible at other times of the year.
	www.umich.edu /~lowbrows/guide/telescope.html (2921 words)

	Meade Instruments Corporation - ETX-90EC Astro Telescope Instruction Manual (Site not responding. Last check: 2007-10-13)
		The ETX-90EC is equipped with R.A. and Dec Setting Circles (14 and 18, Fig.
		Setting circles emulate the celestial coordinates found on star charts or in sky catalogs.
		To use the setting circles to find astronomical objects, the ETX-90EC must first be polar aligned; it is advisable that the motor drive be turned on (see Modes of Operation, page 11) and that a low-power eyepiece (e.g., the SP 26mm eyepiece) be employed.
	www.meade.com /manuals/etx90ec/apc.html (1131 words)

	Astronomical Leage - Astro Note 13: Using Setting Circles
		If you are using a portable mounting, the accuracy with which your setting circles can point your telescope is directly proportional to the accuracy with which you have aligned your mounting to the pole.
		You might be tempted to simply point your telescope at Polaris and set its declination of 89.1 degrees for your declination calibration.
		It is much better to calibrate your circle with a star near the zenith or at least near the declination of your zenith.
	www.astroleague.org /al/astrnote/astnot13.html (773 words)

	JeffPo's Setting Circles & Celestial Coordinates Page
		The most common way of doing this is to point to a known object and rotate the right ascension setting circle dial until it matches the coordinates of this object.
		Now that the setting circles (really only the right ascension circle) are calibrated, the mount can be used to find an object.
		Assuming the miss is not because of a mistake or inadequate setting circles, it could be related to the type of mount and how the clock-drive, if any, functions.
	www.mindspring.com /~jeffpo/settingc.htm (2855 words)

	Sperti Co.
		The instrument is a small fork mounted EQ device with micrometer adjustments for setting latitude and a small single-lense sighting stage for determinition of declination.
		Setting circles (there are six on the device) are all nicely calibrated, etched, color differentiated for South and North latitude adjustment, and easy to read -- though the device is only about 3 3/4" in diameter.
		They have their strong points but setting circles are not among them.
	www.cincytristate.com /sperti_co_.htm (368 words)

	John Foster's Setting Circles Page (Site not responding. Last check: 2007-10-13)
		Move the scope in Declination until the object declination is read on the Declination setting circle.
		Move the scope in RA until the RA setting circle reads the RA at the object.
		so adjust the RA scope axis position until the setting circle reading is adjusted by the time (in hours and minutes) relative to 8 p.m.
	www.icehouse.net /jfoster/circles.html (118 words)

	Weasner's Meade ETX Site
		The RA circle in Figure 7 is set to the right ascension of Vega: "18h 35m." If your clock drive is running, the pointer will NOT be pointing to "18 35" in a short while, but Vega will still be centered in your telescope; hence the need to re-set the circle each move.
		This large circle moves freely (a bit too freely in my opinion) around the "turntable" of the Meade telescopes and care must be exercised when using the circle as it is only fastened into its circle via a small piece of fragile tape at one junction (see Figure 8).
		Using the circles is a very simple task and requires only to 1) properly align and level the telescope before starting; 2) remember to move the RA circle each time you proceed to another object after observing the current one.
	www.weasner.com /etx/ref_guides/setting_circles.html (2857 words)

	Using & Improving the Firstscope 114 (Site not responding. Last check: 2007-10-13)
		For the northern hemisphere, the lower row of numbers of the RA setting circle are used.
		Firstly, they are not very accurate: the coarse divisions on the setting circles and the crude pointers make reading off the numbers a bit of a hit-and-miss affair.
		Nothing much can be done about the design of the mount, but the setting circles can at least tested and if necessary adjusted to improve their reliability if they have been knocked out of alignment during storage or transit.
	users.macunlimited.net /n.monks/using.html (838 words)

	Woodware Designs -- Simple Equatorial Telescope Mount with Setting Circles -- Freebie
		This is the full size declination setting circle that mounts on the scope holder.
		The ascension circle is in hours and the wheel attaches to the mount with the pointer attached to the telescope support.
		The declination circle is in degrees and the wheel is attached to the telescope and the pointer to the pipe support.
	www.charm.net /~jriley/sky/mount1.html (2644 words)

	G-11 User Manual
		The best setting is determined by looking through the eyepiece while changing the direction of the DEC motor and then moving through the TVC settings until the backlash has been eliminated.
		If the declination setting circle is not aligned, move the telescope so that the tube is parallel to the polar axis.
		With both setting circles aligned, you are ready to use the setting circles to locate objects in the night sky.
	www.losmandy.com /g-11-manual.html (8108 words)

	Digital Setting Circles Project (Site not responding. Last check: 2007-10-13)
		Commonly, digital setting circles are set up so that there are 2000 to 8000 tics per revolution of encoder resolution on each axis.
		Set EncoderString to Ek, EncoderComPort to 1, 2, etc., and set AltEncoderCounts and AzEncoderCounts to the number of encoder tics per revolution on the altitude (declination) and azimuth (right ascension) axes, respectively.
		It simply initializes the encoders with the z command (setting resolution to 1024 ticks on each axis), gets the encoder resolutions back by using the h command, and then uses the y command to query the positions in a loop until the ESC key is pressed.
	www.atmsite.org /contrib/Ek/dsc (1541 words)

	Dominos
		Those that only use GOTO telescopes or digital setting circles probably wouldn't understand the accomplishment of getting an object in the field of view using just the manual setting circles.
		This night was one of those nights in which my setting circles were performing wonderfully.
		My setting circles were hitting the objects with great accuracy and despite the less than totally transparent skies, I logged quite a few Herschel objects.
	www.mindspring.com /~jeffpo/dominos.htm (1237 words)

	Astronomy and space for kids
		Set your dials (setting circles) to those numbers, and look through the telescope.
		Note: To use setting circles you have to polar align your telescope.
		Setting circles are a nice accessory for a telescope, they make it much easier to find things in the sky.
	www.kidsastronomy.com /academy/lesson110_assignment3_6.htm (449 words)

	The Curtis Schmidt Users' Manual, part 2 (Site not responding. Last check: 2007-10-13)
		As of this writing, the RA setting circle is marked in 5 minute intervals, with a vernier which can be read to 1 minute.
		Dec setting circle is marked in 1 degree intervals, with a vernier which can be read to 0.1 degrees.
		First set the RA setting circle to the current sideral time (the clock on the desk on the W wall).
	www.astro.lsa.umich.edu /obs/schmidt/manuals/schman/schuman.html (4588 words)

	Vol2:SkyNav
		This chapter reviews telescope mounts to identify the Right Ascension and Declination axes and explain how setting circles are attached to these axes and provide an introduction to how they work.
		The basic operation of the setting circles is explained in three general steps.
		Calibrate the setting circles using the procedures described in Chapters 6 and 8, and the Calibration Star Maps in Chapter 8..
	www.taurus-tech.com /Vol2SkyNav.htm (949 words)

	Discovery Telescopes (Site not responding. Last check: 2007-10-13)
		The German equatorial mount features setting circles and slow motion controls on the R.A. and DEC axes.
		This model uses the German equatorial mount with setting circles and slow motion controls on both the right ascension (R.A.) and declination (DEC.) axes.
		The equatorial mount is quite stable, with setting circles and slow motion controls on both axes for easy, smooth tracking.
	www.discovery-telescopes.com /c-firstscope/c-firstscope.html (1282 words)

	Advanced Astromaster
		While the analog setting circles on your C-8 can be used to find objects, the convenience of digital setting circles can not be discounted.
		Digital setting circles are small computer units that keep track of where your telescope is pointed and allows you to position the scope on an object.
		The early digital setting circles (DSC) were exactly that - all they gave you was the Right Ascension and Declination of your telescope.
	ngc1514.com /Celestron/aam.htm (614 words)

	NGC Review3
		Digital setting circles are the electronic equivalent to the right ascension and declination dials found on many telescope mounts.
		When commercially produced digital setting circles for telescopes were first introduced to the amateur market, the name pretty much described what you got: a digital read-out for the right ascension (RA) and declination (dec.) axes.
		Having personally used digital setting circles for some time, it was good to see inclusions such as these; if they were not supplied in the original package, necessity would have you buying a set (or something similar) after only a few nights usage.
	www.jimsmobile.com /html_docs/ngc_review3.htm (2538 words)

	[No title]
		Included will be the use of setting circles to locate objects not easily found with only the naked eye.
		Because of the limitation in accuracy of the setting circles, if you calibrate the setting circles using an object near the eastern horizon and then try to find a star cluster far to the west, it is unlikely you will find it.
		Set up the telescope with the polar (RA) axis aligned toward the north celestial pole, remove the dust cover, and plug in the drive motor.
	www.phy.cmich.edu /people/williams/lab-ast-112/lab13.doc (745 words)

	Company Seven \| JMI MAX Products Overview: How Digital Setting Circles Work
		The brilliance and clarity of an image are governed by a diversity of technical and physical aspects of a telescope and by interdependent atmospheric conditions.
		Today's "Digital Setting Circle" is a system that can do much more than simply make a Red LED display of the telescope Declination and Right Ascension (or Elevation and Azimuth); modern systems offer a variety of features dictated by the sophistication of the CPU.
		Digital Setting Circle systems do not on their own make a telescope move in any direction to any position such as "Closed Loop Computer Controlled" Systems may do.
	www.company7.com /jmi/overview.html (1757 words)

	Harford County Astronomical Society
		What we call "Digital Setting Circles" today are light years away from what they were just a few years ago.
		If your telescope has manual setting circles, just center Polaris (if you can see it, I can't) in the field of view, set the Declination setting circle to 90, then turn the telescope so that it points East until the setting circle reaches zero.
		To assist and speed up the process at the scope in the dark, I set the mount up in the house, leveled it and centered the weight shaft visually by sighting it against the tripod leg and locking it in position.
	www.harfordastro.org /izar/izar_dsc.html (2119 words)

	Setting Scale Factors in Paper Space (Part 3) (Site not responding. Last check: 2007-10-13)
		You've gone into the Paper World (TILEMODE is now set to 1) and have set up your paper the size you plan on plotting your drawing to.
		After you've set up your scale factors, its soooooooo easy to undo your hard work with simply a misplaced ZOOM or a touch on the wheel of an IntelliMouse.
		After you've set up the appropriate scale factor for your viewports, you may need to pan around within the viewport to get the desired final view.
	cadence.advanstar.com /2001/0901/circles0901.html (1664 words)

	ipedia.com: Amateur telescope making Article (Site not responding. Last check: 2007-10-13)
		The primary mirror reflects and focuses incoming parallel light rays back through the tube of the telescope until they are intercepted by a flat secondary mirror set at a 45 degree angle.
		The Foucault tester is set up at a distance close to the mirror focal point The tester is adjusted so that the returning beam from the pinhole light source is interrupted by the knife edge.
		Some amateurs construct setting circles on their mounts, or use motors that can move by very precise amounts.
	www.ipedia.com /amateur_telescope_making.html (2534 words)

	Orion Telescopes and Binoculars Finding Objects With the Setting Circles (Site not responding. Last check: 2007-10-13)
		Remember that values of the Dec. setting circle are positive when the telescope is pointing north of the celestial equator (Dec. = 0°), and negative when the telescope is pointing south of the celestial equator.
		The lower set is for the Southern Hemisphere.
		Most setting circles are not accurate enough to put an object dead-center in the telescope’s eyepiece, but they should place the object somewhere within the field of view of the finder scope, assuming the equatorial mount is accurately polar aligned.
	www.telescope.com /sdx/176595.jsp (271 words)

	Schmidt Cassegrain telescope advice - scope mount & fork mount basics
		In practice this only worked well if those setting circles were of a very large diameter to provide a detailed scale; typically the setting circles on amateur scopes are too small in diameter to provide a fine-enough scale to accurately aim the scope.
		Run both of those signals to a microprocessor that provides a readout of the position and if the optical encoders are sufficiently accurate you have digital setting circles more accurate than the mechanical setting circles on the scope.
		Such a system is called a Digital Setting Circle system and Celestron and Meade sell them for many of their less-expensive scope mounts.
	sctscopes.net /SCT_Basics/SCT_Mounts/sct_mounts.html (1582 words)

	Tips and Giudes - How to Use your Telescope (Part 1)
		More recent "digital setting circles," electronic readouts that tell where a telescope is pointed, can be vastly more accurate and useful; they're described at the end of this article.
		But having absorbed this lesson, many observers scorn their setting circles forever after, even in situations when they might be quite helpful.
		These methods revolve around the "digital setting circle." In its simplest form, this is nothing more than a readout in little red numbers of what an ordinary setting circle tells you with a dial and pointer.
	telescopesa.za.org /TGHHowTo1.htm (15560 words)

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