Telescopes are specialist optical instruments that have been around for over 400 years and are useful for many applications including seafaring, military operations and especially stargazing. But not ...

Add Yahoo as a preferred source to see more of our stories on Google. Telescope against a starry night Telescopes gather and focus light using precisely-shaped mirrors and lenses (or a combination of ...

In this paper, a Ku-band corrugated feed horn antenna for a Cassegrain reflector is designed and optimized. The horn dimension parameters are optimized so that it has a radiation pattern with a ...

Holiday shopping season has really kicked into gear, and if you have a stargazing fan on your gift list, you have a lot of choices. I think the best thing to do is buy online from one of the major ...

I'm often asked to recommend a telescope, especially around the holidays, when gift-giving is on our minds. Today I'll share a few suggestions, but before we talk specifics, let's look at the ...

If this is the easy part of making a complete reflector telescope from a single piece of glass, we can’t wait to get a load of the hard part! A little backstory may be in order for those who don’t ...

Over the years of writing this column and putting on astronomy and stargazing presentations, I’ve received inquiries from many nice folks about purchasing a telescope for themselves or that special ...

CASSEGRAIN AND GREGORIAN REFLECTORS.—For some time past, Prof. Schaeberle, of the Lick Observatory, has been experimenting on the applications of these rather neglected forms of reflecting telescopes ...

Dual reflector antennas are considered as pencil beam antennas that can produce radiation identical to searchlight. Cassegrain Reflector Antenna Design consists of various effects caused by blockage ...

MELBOURNE OBSERVATORY.—The Annual Report of this Observatory, dated August 14, 1887, states that the buildings and equipment of the Observatory were in good condition with the exception of the mirrors ...