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Jupiter
[ Jupiter ]

·Astronomy: Jupiter - Speed of Light-THE GALILEAN MOONS AND THE SPEED OF LIGHT
·Astronomy: Jupiter - Solar System-SOLAR SYSTEM POT-STIRRER
·Astronomy: Jupiter - Sketching Tool-SKETCHING TOOLS AND TECHNIQUES
·Astronomy: Jupiter - Rotation-ROUND AND ROUND
·Astronomy: Jupiter - Ring-JOVE'S RINGLET
·Astronomy: Jupiter - Photograph-JOVIAN PHOTOS
·Astronomy: Jupiter - Particle-PARTICLES AND FIELDS
·Astronomy: Jupiter - OCCULTATIONS OF JUPITER
·Astronomy: Jupiter - OBSERVING JUPITER
 

 
 
Astronomy & Telescope Astronomy: Telescope Type

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  Telescope Type Telescope Type: Astronomy: Telescope Type - Telescope for Children-BUYING FOR A CHILD

BUYING FOR A CHILD

With their sharp eyesight and insatiable curiosity, children make excellent skywatchers, and the gift of a telescope can lead to a lifelong hobby—or even a career.

 
 
  Posted by astronomy on Saturday, December 11 @ 01:09:39 CST (9 reads)
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  Telescope Type Telescope Type: Astronomy: Telescope Type - SCOPE SPEED

SCOPE SPEED

A specification usually marked on the telescope's tube or given in its instruction manual is the focal length, almost always given in millimeters. This is the length of the light path from the lens or mirror to the focus point. With refractors and reflectors, the focal length is roughly equal to the physical length of the tube.

 
 
  Posted by astronomy on Saturday, December 11 @ 01:08:36 CST (10 reads)
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  Telescope Type Telescope Type: Astronomy: Telescope Type - LENS OR MIRROR

LENS OR MIRROR?

The choice of serious but budget-minded skywatchers is usually a Newtonian reflector, a design relatively unchanged since Isaac Newton invented it in 1668. As a rule, reflectors provide much greater aperture for the money than refractors do, and an economical 4 or 4.5 inch (100 or 110mm) Newtonian can serve as a good starter scope. Several manufacturers now offer very affordable 6 inch (150 mm) reflectors on simple Dobsonian mounts.

 
 
  Posted by astronomy on Saturday, December 11 @ 01:07:40 CST (9 reads)
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  Telescope Type Telescope Type: Astronomy: Telescope Type - Image-WHICH WAY UP

WHICH WAY UP?

All telescope designs produce upside-down images, but the refractors and the Schmidt-Cassegrains are usually used with an accessory called a star diagonal, which fits just in front of the eyepiece.

 
 
  Posted by astronomy on Saturday, December 11 @ 01:06:22 CST (6 reads)
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  Telescope Type Telescope Type: Astronomy: Telescope Type - HYBRID SCOPES

HYBRID SCOPES

Catadioptric telescopes—the Schmidt-Cassegrains and Maksutovs—are hybrids, combining a reflecting mirror with a large corrector lens that eliminates optical distortions.

 
 
  Posted by astronomy on Saturday, December 11 @ 01:05:25 CST (6 reads)
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  Telescope Type Telescope Type: Astronomy: Telescope Type - BUILDING YOUR OWN

BUILDING YOUR OWN

In the past, many amateurs ground their own telescope mirrors. Few pursue this aspect of the hobby today because quality commercial optics are now widely available.

 
 
  Posted by astronomy on Saturday, December 11 @ 01:04:35 CST (6 reads)
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  Telescope Type Telescope Type: Astronomy: Telescope Type - APERTURE NOT POWER

APERTURE NOT POWER

The key specification of any telescope is its aperture—the diameter of the lens or mirror that collects the light. The magnification is unimportant— by changing eyepieces it is possible to make any telescope magnify any amount. But the maximum power any telescope can deliver is equal to about 50 times its aperture in inches.

 
 
  Posted by astronomy on Saturday, December 11 @ 01:03:48 CST (6 reads)
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  Telescope Type Telescope Type: Astronomy: Telescope Type - ALVAN CLARK AND SONS

ALVAN CLARK AND SONS

At the end of the nineteenth century, it was the well-heeled and fortunate amateur.astronomer indeed who owned a telescope made by Alvan dark and'Sons.

 
 
  Posted by astronomy on Saturday, December 11 @ 01:02:56 CST (6 reads)
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  Telescope Type Telescope Type: Astronomy: Telescope Type -

TELESCOPE TYPES

From a no-frills beginner's telescope to an advanced computerized model, a superb selection of tempting equipment awaits the telescope shopper.

 
 
  Posted by astronomy on Saturday, December 11 @ 01:01:50 CST (6 reads)
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