Apple QuickTime movie | 1995-04-27 | 7.0 MB | 240x180 | 30fps | 1 minute, 32 seconds
Transcription: Before the HST can make an observation of one specific star, scientists need a way to describe the target star's location so they can aim the telescope in exactly the right direction. By entering a set of coordinates in right ascension and declination, scientists can quickly call up almost any sector of the sky and examine it closely. Here's how it works. Just as large ground-based telescopes use small finder telescopes to aid in positioning, the HST uses a similar system, but its field of view is composed of three arcs called pickles. In order to get the telescope to point directly at one pos ...
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