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By Erik Gregersen

The evening sky is absolutely teeming with wonders, from celebrity clusters and nebulae to quasars. Astronomy is the potential through which those and different comparable phenomena are stumbled on and saw. This stellar source strains the trail of recent astronomy, from preliminary efforts to map the heavens to todays use of high-tech telescopes and state-of-the-art units that support humans delve deeper into celestial discovery.

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In the 1980s improvements in astronomical technology led to the Second Palomar Observatory Sky Survey (POSS II). Atlases for Stargazing Three modern atlases have gained special popularity among amateur and professional observers alike. Norton’s Star Atlas, perfected through numerous editions, plots all naked-eye stars on eight convenient charts measuring 25 by 43 cm (10 by 17 inches). 0 (1981) includes some 43,000 stars to magnitude eight and is based primarily on the SAO Star Catalog. 5 by 13 inches), include bright star names, boundaries of the Milky Way, and about 2,500 star clusters, nebulas, and galaxies.

Reflectors are not subject to the chromatic problems of refractors, can be better supported mechanically, and can be housed in smaller domes because they are more compact than the long-tube refractors. The angular resolving power (or resolution) of a telescope is the smallest angle between close objects that can be seen clearly to be separate. Resolution is limited by the wave nature of light. For a telescope having an objective lens or mirror with diameter D and operating at wavelength λ, the angular resolution (in radians) can be approximately described by the ratio λ/D.

Only a handful of names have recent origins— for example, Cor Caroli, the brightest star in Canes Venatici, named in 1725 by Edmond Halley. Bayer’s Uranometria of 1603 introduced a system of Greek letters for designating the principal naked-eye stars. In this scheme, the Greek letter is followed by the genitive form of the constellation name, so that alpha (䃇) of Canes Venatici is Alpha Canum Venaticorum. Bayer’s letters and their extension to newer constellations apply to about 1,300 stars. In Historia Coelestis Britannica (published posthumously in 1725), Flamsteed numbered the stars within each of 54 constellations consecutively according to right ascension, and the Flamsteed numbers are customarily used for the fainter naked-eye stars such as 61 Cygni.

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