Download Astronomy on the Personal Computer by Dr. rer. nat. Oliver Montenbruck, Dipl.-Ing. Thomas Pfleger PDF

By Dr. rer. nat. Oliver Montenbruck, Dipl.-Ing. Thomas Pfleger (auth.)

ISBN-10: 3662029820

ISBN-13: 9783662029824

ISBN-10: 3662029847

ISBN-13: 9783662029848

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Example text

Help): Date (year month day hour) ? 27480675 The conversion into ecliptic coordinates can be reversed by selecting option E again, which converts the current (ecliptic) coordinates into equatorial coordinates. 27480675 Let us now recalculate the coordinates for the original equinox of 1950. =Help): 33 P New equinox (yyyy)? 27480675 Conversion of these coordinates into geocentric coordinates should now yield the original coordinates of the vernal equinox, because we have applied inverse transformation to the three conversions that we invoked.

7) 0~/000006T3 = II+p . II and Aare the angles between the x' / x"-ms and the vern-al equinox T 0 at epoch To (xo-ms), and the vernal equinox T at epoch To + T (x-ms), respectively. p denotes precession in longitude, because the change in the vernal equinox mainly takes place in ecliptic longitude. 10) 20 2. 11) + cos f} The most onerous part of calculating precession is determining the values for the various angles and for aij. However, these values only depend on the two epochs T o and To + T, and can be reused if a whole series of different positions are to be converted from one fixed epoch to another.

7) 0~/000006T3 = II+p . II and Aare the angles between the x' / x"-ms and the vern-al equinox T 0 at epoch To (xo-ms), and the vernal equinox T at epoch To + T (x-ms), respectively. p denotes precession in longitude, because the change in the vernal equinox mainly takes place in ecliptic longitude. 10) 20 2. 11) + cos f} The most onerous part of calculating precession is determining the values for the various angles and for aij. However, these values only depend on the two epochs T o and To + T, and can be reused if a whole series of different positions are to be converted from one fixed epoch to another.

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