By Gerald North BSc (auth.)
Every 12 months huge numbers of individuals soak up the examine of astronomy, generally at novice point. there are many common books out there, choked with vibrant photos, yet missing in right reasons of the way and why issues are as they're. many of us finally desire to transcend the 'coffee-table e-book' level and learn this attention-grabbing topic in better intensity. This booklet is written for them. additionally, many folks sit down for public examinations during this topic every year and this booklet can also be meant to be of use to them. the entire themes from the GCSE syllabus are lined right here, with pattern questions on the finish of every bankruptcy. Astronomy Explained offers a finished therapy of the topic in additional intensity than is mostly present in straight forward works, and should be of curiosity to either beginner astronomers and scholars of astronomy.
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Extra info for Astronomy Explained
Out of curio ity I want to know the following: (a) (b) (c) When did the star clu ter reach its greatest altitude? What wa that altitude, measured in degrees, above the horizon? In what compa direction was the star clu ter from me, at that time? ) 13 (a) Which i longer: a olar day, or a sidereal day? (b) To the nearest minute, how long i a sidereal day, mea ured in unit of olar time? The star Rigel crosses the observer's meridian at 21h 30 m UT from a particular observatory on 2 December. (i) What i the local hour angle of Rigel at that instant?
2 The Achromatic Obiective The late eighteenth century saw an invention that was to transform the refractor from an instrument of nearly unmanageable proportions to something more compact and of better optical quality. This was the achromatic object glass, principally developed by Chester Moor Hall and John Dollond. Instead of a single lens, the refractor's object glass was constructed from two elements - a converging lens made of crown glass and a weaker diverging lens made of flint glass. The net result was that the object glass still had the necessary converging power, but the false colour effects inherent in each of the components tended to cancel out (see Fig.
Explain the terms altitude and azimuth, showing how they are used in setting up an alternative to the equatorial coordinate system. What are the major advantages of each system? 6 Draw a diagram that explains the relationship between latitude and the altitude of the pole star from a given location. Include in thi diagram 22 The Celestial Sphere the observer's horizon and the direction of the zenith. What is the greatest altitude of the celestial equator as viewed from a latitude of 35° Nand in which compass direction does it achieve its greatest altitude?