By Gerald North BSc (auth.)
Every 12 months huge numbers of individuals soak up the learn of astronomy, typically at novice point. there are many undemanding books out there, choked with vibrant images, yet missing in right causes of ways and why issues are as they're. many folks finally desire to transcend the 'coffee-table publication' level and learn this attention-grabbing topic in better intensity. This publication is written for them. moreover, many of us sit down for public examinations during this topic every year and this ebook can also be meant to be of use to them. all of the subject matters from the GCSE syllabus are lined right here, with pattern questions on the finish of every bankruptcy. Astronomy Explained offers a accomplished therapy of the topic in additional intensity than is mostly present in straight forward works, and may be of curiosity to either novice astronomers and scholars of astronomy.
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Extra resources for Astronomy Explained
If there is no remainder it is a leap year and February has 29 days, rather than its usual 28. ) are only leap years if they are exactly divisible by 400. Thus 1900 was not a leap year but 2000 will be. Obviously, a small accumulative error will still be present in any artificial system such as this, but since this error will take more than 3000 years to amount to one day, it is ignored. 2. 12 The Solar Day Everyday life requires a time system geared to the passage of day and night, so this system must be linked to the apparent motions of the Sun.
In addition, at a longitude of 180°, a time zone at 24h GMT is adjacent to one at Oh GMT, and so here occurs the International Date Line; when this line is crossed the date changes by one whole day. Fortunately, astronomers have little to do with such complications and refer most of their calculations to sidereal time. 2. 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.
12 r ee from my notebook that I ob erved a particular object, a star clu ter in Hydra, on 16 February 1994. However, I had forgotten to write down the time I observed it, although I had noted that it wa clo e to its greatest altitude. 2 and 5 = -05° 38'. 375 E. 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?