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The iOptron iEQ45 counterweight extension bar threads right on to the supplied counterweight shaft provided with the iEQ45. Designed to create more counter balance weight the counterweight extension bar from iOptron is a great addition to your mount especially for heavier OTA’s. When attached to the counterweight shaft the extension provides an extra 9.5 inches of length.
Price: $50.00
Designed to be an affordable entry level to mid-level computerized GoTo telescope, the NexStar SLT refractors, reflectors, and Maks are available in the most popular sizes and are loaded with valuable design features. With preassembled, adjustable stainless steel tripods, and quick release fork arms and tubes, NexStar SLT telescopes can be set up in a matter of minutes – with no tools required! You can see details of the lunar surface, Venus and its phases, polar caps on Mars, Jupiter and its four moons, Saturn with its rings plainly visible and much more! Most NexStar SLT’s can also be used as a land-based spotting telescope.
Price: $383.80
It’s no wonder customers heap 5-star ratings on this gentle giant. For not only does its jumbo-sized 10-inch optics and uncomplicated design bring a “new level of joy to simple observing,” as raved Astronomy magazine, but it’s also the most affordable quality 10″ Dobsonian on the market. The SkyQuest XT10 Classic Dobsonian telescope isn’t just a good bang for the buck, it’s a supernova of telescope value! Our SkyQuest XT10 Classic Dobsonian gives you the deep-space thrills without the deep-pocket frills. We’ve kept it lean and mean to keep its price low for tight budgets. But rest assured, the XT10 Classic Dob come fully equipped for adventure, whether you’re a beginning stargazer or are graduating to a more capable telescope. The XT10 features an expertly figured parabolic mirror housed in an enameled steel optical tube. The tube rides on a stable Dobsonian base that allows easy point-and-view navigation and has a convenient carrying handle. A 2-inch Crayford focuser, EZ Finder II aiming device, 25mm Sirius Plossl telescope eyepiece (1.25-inch), and quick-collimation cap are all standard equipment. Setup takes only a minute, leaving the rest of the evening to marvel at the planets, the Moon, and a myriad of deep-sky treasures. Enjoy the fantastic views with the Orion SkyQuest XT10 Classic Dobsonian Telescope – and boost your viewing magnification with the included Beginner Barlow Kit!
Price: $599.99
FOR THOSE THAT HAVE A 2″ FOCUS HOUSING, SIMPLY SET THIS IN AND YOU CAN USE 1.25″ EYEPIECES. Set screw slides through the hole in the adapter to the receiving hole on the focuser where the threads are to secure the inserted eyepiece.
MAY BE A MINOR COSMETIC SCRATCH DUE TO TRADE SHOW USE…BUT FULLY FUNCTIONAL.
GALILEO 2″ TO 1.25″ EYEPIECE ADAPTER FOR A 2″FOCUSER
Galileo 2 Inch to 1.25 Inch Eyepiece Adapter – FOR 2 Inch Focuser
Price: $9.95
BUSHNELL 788890 NORTHSTAR 90MM MAKSUTOVE TELESCOPE
1250 X 90MM MOTORIZED GOTO MAKSUTOV-CASSEGRAIN TELESCOPE; 4MM & 25MM EYEPIECES; ERECT IMAGE DIAGONAL MIRROR FOR LANDING VIEW; GO TO COMPUTERIZED TRACKING TECHNOLOGY; RED DOT LED FINDERSCOPE; REMOTE HAND-HELD CONTROL MODULE WITH REAL VOICE OUTPUT
This product meets the oversized requirement per UPS/FedEx. The shipping weight reflected is the dimensional weight. This product also meets the large package requirement per UPS/FedEx. The estimated shipping cost will include this fee.
Price: $596.97
Anyone who has spent much time in the field looking at stars with amateur astronomers is sure to have heard the term “light bucket”. Effective yet inexpensive, “light buckets” provide amateur astronomers with the aperture needed to view faint deep sky object. With the quality and precision designed into the Zhumell Dobson 8″, you can have a really nic bucket for gathering all of that starlight. With a traditional Dobsonian mount, the Dobson 8″ is easy to use. A 2″ focuser accepts a full range of 1.25″ and 2″ format eyepieces. The 8″ mirror provides excellent contrast and definition. Combine these features with quick collimation screws (for easy alignment of your mirror), a black optical tube ( which will acclimate to environmental more quickly than other colors), and an included laser collimator (to make alignment of your mirrors even easier) and you will see that the Zhumell Dobson telescopes are more like 5-gallon pails filled with spectacular views than your standard everyday light bucket.
Price: $550.00
NOTE: This eBook includes color photos and color text. On black and white eReaders, these photos and text will appear as grayscale (so any text that is in color will appear dim on a black and white eReader). The photos are NASA space photos. (NASA did not participate in the writing or publication of this eBook.)
NOTE: 10 new slides wer added on March 18, 2012. (Allow 48 hours for this to take effect.) There are now 50 slides all together (with no change to the list price). The new slides feature large images of the sun and each planet with a brief table of very basic information about each (including size relative to earth, orbital radius relative to earth, mass relative to earth, density, surface temperature, and number of moons).
This eBook provides a highly visual introduction to some basic astronomy concepts that everyone should know, like explaining the phases of the moon and earth-based evidence of the heliocentric model. For full contents, see below. There are 50 full-color slides all together.
NOTE: This book specifically addresses the basic astronomy concepts listed below. (This is not a comprehensive introduction to all astronomy concepts.)
The author, Chris McMullen, is a physics and astronomy instructor at Northwestern State University of Louisiana. He earned his Ph.D. in physics at Oklahoma State University in phenomenological high-energy physics (particle physics). His doctoral dissertation was on the collider phenomenology of superstring-inspired large extra dimensions, a field in which he has coauthored several papers.
All rights are reserved by the author. However, educators may use this material in the classroom for the purpose of teaching astronomy concepts.
Contents:
(1) Overview of the solar system
(2) Understanding the lunar phases
(3) Understanding solar and lunar eclipses
(4) Understanding the seasons
(5) Evidence that the earth is round
(6) Ptolemy’s geocentric model
(7) Aristarchus’/Copernicus’ heliocentric model
(8) Understanding retrograde motion
(9) Objections to the heliocentric model
(10) Overcoming objections to the heliocentric model
(11) Evidence for the heliocentric model
Basic Astronomy Concepts Everyone Should Know (With Space Photos)
