This 15-inch telescope known as "The Great Refractor" was installed at Cambridge in 1847. For 20 years it was the largest telescope in the United States, the most significant American astronomical ...

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Refractor to reflector, Schmidt-Cassegrain to Maksutov-Cassegrain - this is everything you need to know about the different types of telescopes. When you purchase through links on our site, we may ...

Which refractor telescope is best? Space has intrigued humankind ever since we looked skyward for the first time. While it is difficult to imagine what our ancestors thought of the twinkling lights, ...