Download e-book for iPad: Practical astronomy for engineers by Frederick Hanley Seares

By Frederick Hanley Seares

This booklet is a reproduction, made out of electronic photographs of the unique. It was once scanned on the collage of Toronto Libraries and will comprise defects, lacking

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85 astronomical civil ^^ j / 25. Given the apparent solar time at any place, to find the corred a, sponding mean solar time, and vice versa. From equation (36), t and the definitions of mean solar and apparent solar time, we find = =d = M. S. T. A. S. T. A. S. T. = E = M. R. A. of M. R. A. of A. , S. whence M. The S. T. R. A. of M. R. A. of A. S. S. difference S. T. - A. S. T. (42) Equation of Time. The equation of time varies irregularly m It is somethe throughout year, its maximum absolute value being about i6 times positive, and sometimes negative, since the right ascension of the apparent is called the .

Of A. S. S. difference S. T. - A. S. T. (42) Equation of Time. The equation of time varies irregularly m It is somethe throughout year, its maximum absolute value being about i6 times positive, and sometimes negative, since the right ascension of the apparent is called the . sometimes smaller and sometimes greater than that of the mean sun. The ascension of the apparent sun is calculated from the known orbital motion right of the earth. The right ascension of the mean sun is known from its manner sun is TIME TRANSFORMATION This data of definition.

The principle involved in the procedure In thus outlined is called the Method of Successive Approximations. numerical investigations it is of great importance. The method amounts,, practically, to replacing a single complex process by a series, consisting of Ordinarily, the success of the repetitions of some relatively simple operation. method depends upon the number must be made in of repetitions or approximations which If the convergence is order to arrive at the desired result. rapid, so that one or two approximations suffice, the saving in time and labor as compared with the direct solution is frequently very great.

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Practical astronomy for engineers by Frederick Hanley Seares


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