By Gerald North BSc (auth.)
Every 12 months huge numbers of individuals soak up the examine of astronomy, typically at beginner point. there are many ordinary books out there, choked with vibrant pictures, yet missing in right causes of the way and why issues are as they're. many folks ultimately desire to transcend the 'coffee-table ebook' level and learn this attention-grabbing topic in better intensity. This e-book is written for them. additionally, many folks take a seat for public examinations during this topic every year and this ebook can also be meant to be of use to them. the entire issues from the GCSE syllabus are lined right here, with pattern questions on the finish of every bankruptcy. Astronomy Explained presents a accomplished therapy of the topic in additional intensity than is generally present in simple works, and may be of curiosity to either novice astronomers and scholars of astronomy.
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Additional info for Astronomy Explained
We call this defect chromatic aberration. The trouble arose because the simple lenses used could not bring all the colours to a coincident focus (see Fig. 3). The focal length of a lens divided by its diameter is known as its focal ratio, or f-number. 2 m is an f/12 lens. The early experimenters found that the chromatic aberration in a lens could be reduced if the focal ratio, and hence the focal length, was made large. 1 The simple refractor. 2 The Galilean refractor. 3 Chromatic aberration . 46 The Telescope were constructed.
1 5 Hour Angle We have already seen that a star on the celestial sphere can be thought of as lying on a celestial meridian (a great circle joining the celestial poles). It is important to understand that this particular great circle is fixed with respect to the stars and is thus moving, at the diurnal rate, with respect to the observer's meridian. This great circle is known as the hour circle of the star considered. The angle that the hour circle makes with the observer's meridian, measured westwards from the meridian in units of time, is called the hour angle of the star.
2 Define a great circle. Explain the term meridian in the context of (a) the Earth and (b) the celestial sphere. Explain fully how the coordinate ystem for navigation on the Earth's surface ha been et up. Your answer should include the ignificance of the Greenwich Meridian. 3 Explain fully the coordinate system used by astronomers for celestial objects, including such points as: positive and negative declinations, the Vernal Equinox, the rotation of the Earth, idereal time, etc. 4 What cau e the stars to move across the ky?