| 翻訳と辞書 |
| Orange County Astronomers ： ウィキペディア英語版 |
Orange County Astronomers
Orange County Astronomers (OCA) started life in 1967 when a small group of intrepid amateur astronomers got together to form a club. Those were the days when an amateur built his own telescope, usually a Newtonian reflector. It was a laborious process of grinding a mirror to as close to a 1/4 wave as you could get. Then you built the tube and assembly so you could actually search out a dark patch of sky to look up at the stars. It helped to know about stepping motors and who was building the best drives to keep your telescope tracking your object. And that was another thing – you had to get on intimate terms with the night skies for all seasons. That was a daunting task for many and proved to be a barrier to many but the most dedicated observer.
==History==
Computers were just coming onto the personal scene. The operating systems were mostly proprietary to the computer maker. That meant that Kaypro had its own system; so did many of the other small manufacturers. A big system at that time might be 124 KB. Yes, I said KB, as in kilobytes. It was nirvana indeed when the first system came out that was a whole MB. The game changer was the standardization by IBM of the personal computer and the Operating system by Microsoft. Apple was also on the scene then, but chose to keep their Operating system a proprietary one. There were no CCD cameras for amateurs and no GoTo systems, like there is now. So people in those days hung out with the engineers in the club who were doing most of the experimentation with the then esoteric stuff like the CCD chips and nitrogen-cooled cameras.
It was about this time that Tom Johnson started work on a Schmidt-Cassegrain design for small telescopes. While the design had been around since the 1930s, only a few of the instruments had been produced. The problem was the difficulty in figuring the corrector plate. By the mid 1960s Tom had built his first Schmidt-Cassegrain, an 18 inch model. He realized that he would have to build smaller telescopes to appeal price-wise to the growing amateur community. The first models were still too high for the typical amateur astronomer, but as prices came down, more amateurs could afford them.
So the Orange County Astronomers started and grew at the right time to take advantage of this coming era. And as the OCA grew, the club ultimately moved into its present meeting place at Chapman University. Speakers at the club meetings also began to reflect the growing size of the OCA community; members were hearing professional astronomers showcase their research.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「Orange County Astronomers」の詳細全文を読む
スポンサード リンク
| 翻訳と辞書 : 翻訳のためのインターネットリソース |
Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.
|
|