So far in this series we have discussed types of telescopes and mounts. The next part of decisions to make when buying your first telescope is what sort of eyepieces to have? Most telescopes come with two eyepieces when you purchase them. There are many types to choose from, each with advantages and disadvantages, depending on the type of telescope you bought and how you intend to use it. So I will take some time and go through the details.
As described in the previous article, telescopes comes in three flavors, refractors which are great for planetary observations, reflectors which are great for ‘deep sky’ observations, and the composite or catadioptric telescopes which are composites of refractors and reflectors, such as the popular Schmidt-Cassegrain type. Well, there is one more major consideration in choosing your first telescope, the type of mount. There are two basic types, altazimuth and equatorial.
Greeks earliest sighting of Halley’s comet in history around 466 BC say scientists. The Journal of Cosmology says that the Greeks may have seen the comet during a period of 80 days in 466BC. The previous earliest reference to Halley’s comet was by the Chinese is 240 BC, according to New Scientist magazine. But writings by the ancient Greeks about a large meteorite falling between 466 – 467 BC may change who saw Halley’s comet first.
