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Types of telescopes What are the advantages of each

Refractors, Newtonian reflectors and Catadioptrics
are the three main types of telescopes. All these
different types have the same purpose, but each
telescope design does it differently. Collecting
light and bringing it to a point of focus so it can be
magnified and examined with an eyepiece is their
goal.

Of the different types of telescopes the refractor
is the telescope most people think of when they
think of astronomy. This type of astronomy telescope
is easy to use and reliable due to the simplicity
of design. It requires little or no maintenance. Its
great for looking at the different types of lunar,
planetary, and binary stars.

Newtonians are a type of telescope, which is also
known as catoptrics. This type is different from
the other telescopes because it has the lowest
per inch of aperture compared to refractors and
Catadioptrics, because lenses are more expensive
to produce than mirrors, especially in medium
to large apertures. Newtonians deliver very bright
images and are low in optical aberrations.

Catadoptric telescopes are the most popular type
of instrument, with the most modern design,
marketed throughout the world in 3 1/2 and larger
apertures. Its very good for looking at different
planetary, lunar, and binary stars. If you like to
take photos with your telescope this type of
instrument is excellent for deep sky observing
or astrophotography with fast films or CCD's.

About the author:
Jeremy Hier makes it easy and quick to decide which telescope
is best for you by going to

What's The Difference Between Distance Learning And American Public Schools? John TiptonBefore distance learning and elearning, students in rural
school districts were often at a great disadvantage when it
came to subjects being offered. A small school district
sometimes didn't have the resources to attract teachers
that were in high demand.

Math, science and foreign language classes were often
limited because of this shortage. Today, distance learning
and elearning have changed the way school districts
determine class schedules, making many more opportunities
available to students.

Public schools have changed dramatically over the past
century and a great number of those changes can be put down
to two factors - state and federal mandates governing the
classes that must be offered and requirements for
graduation, and (of course) the ever-increasing world of
technology.

Computers have made the world a global neighborhood in
which anyone can instantly communicate with those from
another country, even if that country is half way around
the world. Language and time differences are virtually the
only barriers. This means that distance learning and
elearning are a part of the curriculum of many schools.

As schools began to connect to the Internet, the immediate
concern in most cases was how to regulate the use. The next
was how to best use the technology to benefit school
districts and students. Distance learning and elearning
became the way to provide options, especially in those
rural districts that couldn't meet state mandates.

Consider the situation of many smaller, rural schools. If
the school is required to offer a foreign language but
can't recruit a teacher, what should happen to that school?
Forced consolidations have been common in some states.
Students lost the benefits of schools in their own towns
and faced long bus rides to new districts.

With distance learning and elearning, more schools can meet
the state and federal mandates to offer specific classes.

Consider yet another situation. A smaller district has four
students who show great promise in their math studies and
it's quickly apparent that they could go well beyond the
normal math classes offered in high school.

There's no one on the teaching staff capable of teaching
those advanced concepts and it's financially impossible to
hire someone for that task alone. Distance learning or e-
earning could provide those classes.

Special needs children are another group to greatly benefit
from distance learning and elearning. While many issues can
only be dealt with between teacher and student, face-to-
face, there are many things that can be taught and learned
online.

Whether the subject of distance learning or elearning is a
foreign language or sign language, and whether the class or
courses are being offered to one student or the entire
student body, distance learning and elearning have become
an important tool for many public schools.
===========================================================
Find out why distance learning lets anyone go back to
school. Discover what you need to look for in a distance
learning program, and what you should avoid. Click
http://www.distance-learning-exclusive.com/distance-learning-colleges.html

About the author:
John Tipton dropped out of school early, and worked boring
jobs for 20 years. Then he discovered 'distance learning'
and finally got the education he missed. After lots of
different courses at lots of different schools, Peter
shares his experience in this series of useful articles.

meade Products we recommend
Magnacraft 50 and 100 Power Telescope SPTEL

Magnacraft 50 and 100 Power Telescope SPTEL
Magnacraft 50 and 100 Power Telescope. Visually travel the wonders of our vast universe with this 50mm telescope. Measures 23" long 21/2" diameter. The advanced optical system of genuine glass optics brings beautiful images sharply into view. The light weight aluminum barrel body is easily operated and adjusted for viewing objects both in and out of this world Includes 23" scope and adjustable tripod. Gift boxed 5 lbs. 5200PT 89.95 Item #SPTEL

Borg-Warner R4745 Tilt/Telescope Relay

Planetarium Gold Gift Set

Brunton Eclipse, Mirror Sight, 3 Clino's

Brunton Eclipse, Mirror Sight, 3 Clino's
The Eclipse 8099 is an all-in-one professional compass that serves as both a baseplate and a mirrored sighting map compass. Designed for easy-navigation, the 8099 features three clinometer systems and Brunton's patented circle-over-circle alignment system. Includes field reference cards for mapping and emergency skills. 4.1"x2.5"x1" 3.6 oz. Magnified read out 1 graduations Field reference cards 3 inclinometer systems Declination adjustable USGS map scale 1:24k, ft., UTM. mile "Circle over circle" alignment system Map magnifier LanyardManufacturer: Brunton. Manufacturer#: 8099. Approximate Shipping Weight (lbs): 0.5.

Nikon Premier LX-L 10x25 Binoculars

Nikon Premier LX-L 10x25 Binoculars
Traditionally, a 10x25 binocular is perfectly suited for theater and stadium use. Extraordinarily compact, it provides ample magnification with a reduced field of view so you can focus on character and action details. Of course, it's really lightweight and easy to carry around. The Nikon Premier LX offers superior optics and all-weather protection so you can use it as a very compact birding and field scope. It's especially useful when travelling because it doesn't occupy lots of luggage space - great for travelling light. It includes a leather case and lens protectors. Superior optics, sharp focus, and long-eye relief (for eyeglass wearers) contribute to help make the Premier LX a top performer for theater and sports viewing that's more than effective in other applications too. In the unlikely event something goes wrong with a Nikon Premier LX binocular, you can enjoy the reassurance of Nikon's 25 year Limited Warranty. Water and Fog resistant Durable, lightweight magnesium-alloy construction Eco-Glass manufactured without lead or arsenic Soft-touch silicon rubber for the eyecups Includes Soft Leather Case and carrying strap Non-vinyl chloride body materials for comfortable, safe, secure touch Center Focus control Field-of-View (@ 1000 Yds) 282' (94 m at 1000 m) Minimum Focus Distance 10.5' (3.2 m) Exit Pupil Diameter 2.5mm Eye Relief 15mm Relative Brightness 6.3 Twilight Factor 15.8 Water and Fog resistant Unit Dimensions 4.4 x 4.3 WxH / Weight 0.66 lb

Nikon Premier LX-L 8x42 Binoculars

Nikon Premier LX-L 8x42 Binoculars
Nikon 8x42 Premier LX Binoculars 7502Nikon 8x42mm Premier LX Binoculars - 7502: NEW, New Nikon 8x42 Premier LX Binoculars 7502, Full Nikon Warranty Model NI-BI-7502

The Design and Construction of Large Optical Telescopes

The Design and Construction of Large Optical Telescopes
This book assembles for the first time in a single text the full range of astronomical and engineering principles used in the design and construction of large telescopes. It aims to cover all aspects of the field, from the fundamentals of astronomical observation, to optics, control systems, and structural, mechanical, and thermal engineering, as well as such specialized topics as site selection and program management. The book is the result of the collaboration of many leading astronomers, engineers, and project managers. Their contributions have been edited to provide a consistent approach and treatment: for example, ground- and space-based telescopes are treated from a common perspective. Topics covered include: - Design Methods and Project Management - Telescope Optics - Stray Light Control - Structure and Mechanisms - Pointing and Control - Active and Adaptive Optics - Thermal Control - Integration and Verification - Observatory Enclosure and Siting

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