By W. D. Heintz (auth.), Dipl.-Kfm. Günter Dietmar Roth (eds.)

Several many years have elapsed because the e-book of any comparable publication within the German language. the inability of this sort of e-book has been felt keenly by way of all buddies of astronomy. In our house age, astronomical wisdom arouses public curiosity increasingly more. useful statement on the telescope relies greater than the rest on such wisdom. the academic worth of the sort of education is undisputed. nevertheless, the paintings of the novice astronomer may also give a contribution basically to the paintings of the pros. it's from those issues of view that this guide goals to aid with flexible suggestion. while, the publication intends to teach the wide variety of utilized astronomy, because it provides itself to the pal of the celebrities; in mathematical-physical fields, in precision mechanics and optics, and final yet no longer least within the quarter of social family. past the circle of novice astronomers the e-book is addressed to teachers, academics, scholars and scholars. It needs to serve them as a consultant to "astronomical experiments", which we advise can be played in fundamental and secondary faculties, expert schools, and extramural courses.

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Astronomy a Handbook

A number of a long time have elapsed because the ebook of any related publication within the German language. the inability of this type of publication has been felt keenly by way of all buddies of astronomy. In our house age, astronomical wisdom arouses public curiosity increasingly more. sensible remark on the telescope relies greater than the rest on such wisdom.

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Further advantages of the achromatic objective lenses are insensitivity against changes of temperature and humidity and the ease with which the single lens surface, which is on the outside, can be cleaned. As a rule of thumb for achromatic objectives we may note that the secondary spectrum is sufficiently suppressed if, in centimeters, Focal length of an achromat = 2 x (diameter of the aperture)2. (34) In a telescope 50/540, which contains an objective of the FRAUNHOFER type, this rule of thumb is realized.

Uber die Reichweite von Objectiven bei Astroaufnahmen mit kleinen Montierungen. Sterne und Weltraum 3, 262 (1964). 1. Diameter of the Blackening Disks b and the Attained Limiting Magnitude mo No. 7 A. 4/31 cm Mirror-lens objective 1:4/50 cm B. 5/175 cm NOTE: 1= focal length; d = free aperture; classes per square degree. 9. The Influence of Air Disturbance on the Star Images Air disturbance leads to variations of the brightness, the size, the color, and the position of the telescopic images. The brightness variations (intensity changes and scintillation) range from the smallest variations to complete short-time disappearance of the star.

JAHN 36 photographic observations. For visual observation the aperture ratio 1: 20 is advisable so that the deviations from spherical shape and the color error can be kept small (see page 32). , by the use of a yellow filter together with a blue sensitive plate. The focal length of a lens depends on the thickness g of the lens, on the refraction index n of the glass for the various wavelengths, and on the two radii r 1 and r2 of the curvature of the surfaces of the lens. It is 1 (11-1)2 j 11 -.

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