Why Do Astronomers Push To Achieve Ever Larger Diameter Mirrors For Their Telescopes?
Tuesday, February 16th, 2010 at
6:07 am
; or what is the purpose of having larger diameter mirrors on telescopes?
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US $1.00
now up: Why we become astronomers. The answer is "the rest of you can have money, we want the stars."
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I guess it COULD be possible… but a blood test is the only thing that is really 100% accurate with that, besides an ultrasound that is. Maybe you should go see a doctor?
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Maybe it sounds redundant but that is how it's done. Put the key in, turn one click and push the button. Racecars and motorscooters are set up that way as well
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It's 2.5 inches longer, .02 inches narrower, and 22 pounds heavier.
2005
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Height: 55.4 in. Wheel Base: 97.1 in.
Curb Weight: 2524 lbs. Gross Weight: 3340 lbs.
2007
Length: 145.6 in. Width: 66.3 in.
Height: 55.4 in. Wheel Base: 97.1 in.
Curb Weight: 2546 lbs. Gross Weight: 3362 lbs.
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Michael David Ward, or David Archer.
Looks like Gateway Arch in St. Louis
good morning girls
Concerned about increased air pollution and a marred landscape, residents in Duarte are protesting a proposal to relocate an operation to a ridge above the city.
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The FORCE of interaction is the SAME between parent and child "pushing off" each other. Therefore with child acceleration at 2.6 m/s², FORCE (F) = (12)(2.6) = 31.2 N.
The acceleration of the parent = 31.2/60 = 0.52 m/s².
d = 1/2at²
The distance the child travels in 3 s = 1/2(2.6)(3)² = 11.7 m
The distance the parent travels in 3 s = 1/2(0.52)(3)² = 2.34 m
Total separation distance after 3 s = 11.7 + 2.3 = 14.0 m ANS
the 1488 cc Hildebrand & Wolfmuller made in the 1880s was push only also to stop you just turned off motor.
but many drag race bikes are push start only
First to clear up some terminology: when astronomers use the word "lens" they are referring only to the main objective lens of a refractor, or possibly to the individual component lenses that make up an eyepiece or other optical system. I think you are asking here about _eyepieces_, not lenses.
There is no reason to stay within a brand; virtually all astronomical equipment is highly compatible. Certainly, all Orion's eyepieces work with the XT8, as do all eyepieces by every other manufacturer. Very very rarely you may find an eyepiece which won't reach focus in a particular telescope, but I've only ever encountered this two or three times in over 50 years, 25 telescopes, and countless eyepieces.
A Barlow lens is a device which you place between eyepiece and telescope which increases the effective magnification, similar to a teleconverter in photography. It's main side effect is making the image much dimmer, so it's usually only used with bright objects.
I believe the XT8i comes with two eyepieces as standard equipment: 25mm and 10mm Plössls. Plössl is a particular design of eyepiece, normally with four lenses, and is a good starting eyepiece. The 25mm is a pretty good eyepiece, the 10mm less so. The different focal lengths of eyepieces give different magnifications with a given scope. You calculate this by dividing the focal length of the scope (1200mm) by the focal length of the eyepiece, so the 25mm gives 48x and the 10mm 120x.
These are good magnifications to start out with; you may want to add a shorter focal length (around 5 mm) for the Moon and planets, amd a longer focal length (around 32mm) for large objects. There are many different designs of eyepieces, most of which offer a wider field of view or more comfortable eye relief (how close you have to put your eye) than the standard Plössl.
Don't feel like you need to add any hardware right away. Get to know the standard equipment first. It's more important to spend your extra money on a good star atlas (the Sky & Telescope Pocket Sky Atlas is about the best) and a good guide book like NightWatch by Terence Dickinson or Star Watch by Philip Harrington. A red flashlight and a decent 10×50 binocular are essential accessories for deep sky observing.
"What exactly I'm looking for, are lens' that will give me better viewing quality. Something that will focus easier/better, something that will magnify whatever I'm viewing, and something that will increase the detail in what I'm viewing."
Most of what you're asking for here comes with _experience_ at the eyepiece, and is not gained by buying accessories! A few hours spent sketching what you see at the eyepiece will gain you more than anything you can buy!
RT #ZodiacFact Virgos are able to be independent but the less evolvedtypes will have difficult if someone is not there helping them to achieve
a diameter tape measure has the units pre-calculated in "pi" units.
Circumference = pi x diameter.
or more to the point,
diameter = Circumference/pi
so this special tape would read "3.18" at the same position a normal tape would read "10". this saves time and thinking, but a regular tape works just as good, just divide every reading by pi (3.1416)
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