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21Astrograph — An Astrograph (astrographic camera) is a telescope designed for the sole purpose of astrophotography. Astrographs are usually used in wide field surveys of the night sky as well as detection of objects such as asteroids, meteors, and… …
22Image differencing — is an image processing technique used to determine changes between images. The difference between two images is calculated by finding the difference between each pixel in each image, and generating an image based on the result. For this technique …
23Carl Pulfrich — (September 24, 1858 ndash; August 12, 1927) was a German physicist, noted for advancements in optics made as a researcher for the Carl Zeiss company in Jena around 1880, and for documenting the Pulfrich effect, a psycho optical phenomenon that… …
24Tombaugh, Clyde William — ▪ 1998 American astronomer (b. Feb. 4, 1906, Streator, Ill. d. Jan. 17, 1997, Las Cruces, N.M.), discovered the planet Pluto, the ninth planet in the solar system and the only one found in the 20th century. Tombaugh was 24 years of age when …
25Lowell , Percival — (1855–1916) American astronomer Born in Boston, Massachusetts, Lowell graduated from Harvard in 1876. His first interest was oriental studies but Giovanni Schiaparelli s report in 1877 of the ‘canali’ (mistranslated as ‘canals’) of Mars had… …
26Tombaugh , Clyde William — (1906–1997) American astronomer Tombaugh came from a poor farming background in Streator, Illinois; although he never went to college he managed to teach himself enough of the basic observational skills to be taken on by the Lowell Observatory in …
27List of Doctor Who items — This is a list of items from the BBC television series Doctor Who. Contents: Top · 0–9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z 0–9 …
28TRS-80 Color Computer — 16k TRS 80 Color Computer 1 Developer Tandy Corporation Manufacturer Motorola Release date 1980 …
