THE Yerkes Observatory, which has recently been completed and inaugurated, contains in its instrumental equipment the largest refractor in the world, the diameter of the object-glass spanning 40 ...

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 ...

The Celestron Omni XLT 120 is made for the seasoned skywatcher, who is looking for that sought-after combination of high-quality build and superb views of the solar system and lunar surface. While a ...

IT has been supposed that the difference between the zenith distance of a star obtained by direct observation and that obtained by observing it reflected in a pool of mercury—as it is not fully ...

For most of us who are not astronomers, the image that comes to mind when describing a reflecting telescope is of a huge instrument in its own domed-roof building on a mountain top. But a reflecting ...

It's being called "the world's biggest eye on the sky." Scientists are building the world's largest optical reflecting telescope in Chile, a tool so powerful it will enable man to study ancient ...