| 期刊全称 | AstroFAQs | | 期刊简称 | Questions Amateur As | | 影响因子2023 | Stephen F. Tonkin | | 视频video | | | 发行地址 | Provides the necessary information to choose and use astronomical equipment effectively.Explains the underlying principles in a unique and easy-to-understand way.There is a glossary and suggestions fo | | 学科分类 | The Patrick Moore Practical Astronomy Series | | 图书封面 |  | | 影响因子 | An increasing number of people are taking advantage of the relatively low prices of astronomical equipment. Many of these people are doing so with little knowledge of practical astronomy and, as the volume of questions asked at astronomical society meetings and on internet newsgroups attest, there is a need for these questions to be answered in one place. Hence this book. The fundamental premise behind AstroFAQs is that the beginning amateur astronomer wishes to get "up and running" with the minimum delay. A secondary premise is that anyone will better appreciate why something is done as it is if there is an understanding of the underlying principles. AstroFAQs addresses both these premises. AstroFAQs makes no pretence to go into great depth -that would be impossible in such a slim volume -but it will give you the kick-start you need to choose and use your instrument effectively, and will take you to a level of expertise that is significantly higher than the "beginner" status. It uses a hierarchical section num bering system that simplifies cross-referencing. Suggestions for more in-depth reading are given throughout. More and more "newbie" astronomers are entering this fascinatin | | Pindex | Book 2000 |
| 1 |
Front Matter |
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Abstract
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| 2 |
,Choosing Equipment, |
Stephen F. Tonkin |
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Abstract
Two numbers, e.g. 10 × 50 or 11 × 80, designate a binocular. The first of these numbers is the magnification; the second is the diameter of the objective lenses in millimetres. For example, a 7 × 50 binocular has a magnification of ×7 and objective lenses of diameter 50 mm.
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| 3 |
,Setting Up, |
Stephen F. Tonkin |
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Abstract
In order to track an object successfully with a single motion, the polar (RA) axis of an equatorial mount must be parallel to the axis of rotation of the Earth.
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| 4 |
,Getting the Best out of Your Optics, |
Stephen F. Tonkin |
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Abstract
To get the best out of a telescope for astronomy, it helps if you understand how it works. A telescope, when used for astronomy, serves three functions: it magnifies, it increases light grasp, and it increases resolution.
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| 5 |
,Observation, |
Stephen F. Tonkin |
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Abstract
The three components of good observing conditions are transparency, lack of sky brightness, and seeing. Understanding these components and the effect they have on observing will help you get the most out of your telescope.
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| 6 |
,Understanding the Celestial Sphere, |
Stephen F. Tonkin |
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Abstract
We imagine that astronomical objects are projected onto a celestial sphere, centred upon the Earth. The Earth’s North and South poles are projected to the North Celestial Pole (NCP) and South Celestial Pole (SCP), respectively. The Earth’s equatorial plane passes through the Celestial Equator (see Figure 5.1).
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| 7 |
,Miscellaneous, |
Stephen F. Tonkin |
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Abstract
In order to know how to combat dew, it is important to have some understanding of why it forms. Warm air can hold more moisture than cold air. Hence when warmer, moist air cools down, there will come a point where it is saturated and will begin to give up its moisture. The principles of dew reduction are then simple: reduce the amount of cooling of the optical surfaces and reduce the amount of warm moist air (e.g. breath) that comes into contact with them.
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| 8 |
,Handy Formulae, |
Stephen F. Tonkin |
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Abstract
where .. . focal length of objective lens or primary mirror; and ... focal length of eyepiece.
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| 9 |
,Glossary, |
Stephen F. Tonkin |
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Abstract
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| 10 |
,Bibliography, |
Stephen F. Tonkin |
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Abstract
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发表于 2025-3-21 18:32:53
