By C. R. Kitchin
The function of this e-book is two-fold. to begin with to supply a convenient quickly resource of ref erence of the phrases, innovations, tools, formulation, techniques, and so forth. , for working towards observers, if it is their first glance through anyone else's small telescope, or whether or not they have spent many years development their very own tools, staring at with them and are on a regular basis generating effects to rival these of the pros. it's not largely geared toward specialist observers, yet to be able to be sufficiently compre hensive for its meant viewers, many entries were incorporated with a purpose to be proper at that point. specifically notwithstanding, the extra esoteric components of spectroscopy haven't been incorporated. References to express observatories are incorporated if their instrumentation contains optical telescopes over 1 m in diameter or radio dishes over 20 m. person entries for telescopes of four m or over are incorporated, and for the bigger radio tools, plus different telescopes which may be of curiosity for ancient or different purposes (for instance the 1m Yerkes refractor). Spacecraft have more often than not now not been integrated (apart from the Hubble area telescope) simply because their brief operating lives suggest that almost all present spacecraft will now not be working by the point that this publication is released. additionally the names of spacecraft are usually replaced after release making it tricky to spot which venture is which. References to advertisement corporations, and to a few extensively to be had advertisement items were includ ed, yet an proceeding customer must always receive updated information.
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Extra info for Illustrated Dictionary of Practical Astronomy
Sample text
COMo\ N1CU • ,. LIO_ .. ' " ,.. f 10 VIRGO (port 01) · 11 LIBRA • (1 • SPICO • HYDRA (port 01) CORVUS SCORPIUS • (port of) • (pori 01) , • • LUPUS • . II • 0 • . / ·u NORMA .. • ClRCINUS · • u . p p. TRIANGULUM AUSTRALE . Y . ' p' CENTAURUS o( Cen CRUX ·· .. VELA (pori of) a • MUSCA '(1 • N OCTANS (port 01) Crux and the nearby constellations 50 CHAMAELEON (port 01) • P CARINA (port 01) N contrast The difference between the light and dark portions of an object or an image. contrast index A measure of the contrast of a photographic emulsion.
Correcting lens A lens specifically designed to correct aberrations produced by the remainder of the optical system. The lenses are usually thin and of low or zero overall power. The use of aspheric surfaces and exotic optical materials is quite common. Correcting lenses are found as an integral part of the design of Schmidt cameras, Schmidt-Cassegrain and Maksutov telescopes. Correcting lenses are also often used before the prime focuses of large telescopes where they provide sharply focused images over a relatively wide field of view (for example the two degree field (2df) on the AAT).
Ciel et Espace A popular French-based astronomical magazine. circle of least confusion In an optical system that is affected by aberrations, this is the point at which the image appears to be in best focus. 41 Red i circularly polarized radiation Electromagnetic radiation in which the direction of the electric vector rotates with time at the frequency of the radiation. See also: elliptically polarized radiation; linearly polarized radiation. circumpolar An object that is either always above, or always below, the horizon.