By Michael A. Covington
The 1st guide that describes tips on how to commence gazing the sky with a automated telescope.
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Extra info for How to Use a Computerized Telescope: Practical Amateur Astronomy
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5). Then refine the alignment by sighting on Polaris and/or by using the drift method (p. 49). Note that in the daytime, you can use the drift method on a bright star; stars down to second or third magnitude are visible in the telescope at high magnification. You can also use the drift method on planets, but not the Moon, whose orbital motion is fast enough to interfere. 3 Finding Polaris Alone of all the stars, Polaris is always in the same position in the sky. Ursa Major and/or Cassiopeia always indicate its position.
As this is written, in 2002, the two are very close. 2 How precession works Right ascension zero is defined as the point where the Sun crosses the celestial equator, moving northward, in the spring. Because of precession, this point is not fixed. Its movement can be visualized in two ways. One way to describe precession is to say that the north celestial pole is gradually moving among the stars, tracing out a large circle every 25 770 years. Right now the 17 How the sky moves pole is close to Polaris; in 2100 it will be closer.
2 Factors that affect pointing accuracy Despite what people think, precise site data and accurate placement in home position are not necessary for accurate pointing, at least as long as you align on two stars. ) The factors that affect pointing accuracy are: 32 (1) Choice of alignment stars. See p. 28. If you use two alignment stars that are too close together, any small error in the position of one star will be magnified as it is extended around the sky. (2) Accuracy of initial alignment. It is important to center all alignment stars (including stars that you sync on, later in the session), not just get them into the field.