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equinox

(Encyclopedia)equinox ēˈkwĭnŏks [key], either of two points on the celestial sphere where the ecliptic and the celestial equator intersect. The vernal equinox, also known as “the first point of Aries,” is t...

ionosphere

(Encyclopedia)ionosphere īŏnˈəsfēr [key], series of concentric ionized layers forming part of the upper atmosphere of the earth from around 30 to 50 mi (50 to 80 km) to 250 to 370 mi (400 to 600 km) where it m...

Munsey, Frank Andrew

(Encyclopedia)Munsey, Frank Andrew mŭnˈsē [key], 1854–1925, American publisher and author, b. Mercer, Maine. In 1882 he quit a telegraph operator's job in Maine to begin a career as publisher in New York City....

Olbers, Heinrich Wilhelm Matthäus

(Encyclopedia)Olbers, Heinrich Wilhelm Matthäus hīnˈrĭkh vĭlˈhĕlm mätĕˈo͝os ôlˈbərs [key], 1758–1840, German astronomer and physician. He originated (1797) the first satisfactory method for calculat...

Brahe, Tycho

(Encyclopedia)Brahe, Tycho tīˈkō brä [key], 1546–1601, Danish astronomer. The most prominent astronomer of the late 16th cent., he paved the way for future discoveries by improving instruments and by his prec...

Breuer, Marcel Lajos

(Encyclopedia)Breuer, Marcel Lajos broiˈər [key], 1902–81, American architect and furniture designer, b. Hungary. During the 1920s he was associated, both as student and as teacher, with the Bauhaus in Germany....

unidentified flying object

(Encyclopedia)unidentified flying object or UFO, an object or light reportedly seen in the sky whose appearance, trajectory, and general dynamic and luminescent behavior do not readily suggest a logical, convention...

Sirius

(Encyclopedia)Sirius sĭrˈēəs [key], or Dog Star, brightest star in the sky. It is located in the constellation Canis Major (1992 position R.A. 6h44.8m, Dec. −16°42′); its Bayer designation is Alpha Canis M...

Donati, Giovanni Battista

(Encyclopedia)Donati, Giovanni Battista jōvänˈnē bät-tēsˈtä dōnäˈtē [key], 1826–73, Italian astronomer, b. Pisa. Serving as director of the Florence Observatory from 1864, he was a pioneer in the spec...

cold frame

(Encyclopedia)cold frame, in horticulture, sun-heated board frame covered with a removable top of glass or other transparent material and sunk into the ground. The top may be solid or slatted or screened for shade....