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Sitter, Willem de

(Encyclopedia)Sitter, Willem de vĭlˈəm də sĭtˈər [key], 1872–1934, Dutch astronomer and mathematician. He was professor from 1908 at the Univ. of Leiden and in 1919 became director of its observatory. His ...

divine right

(Encyclopedia)divine right, doctrine that sovereigns derive their right to rule by virtue of their birth alone—a right based on the law of God and of nature. Authority is transmitted to a ruler from his ancestors...

Frothingham, Octavius Brooks

(Encyclopedia)Frothingham, Octavius Brooks frŏᵺˈĭnghəm [key], 1822–95, American clergyman and writer, b. Boston. While a Unitarian minister in Salem (1847–55) he came under the influence of Theodore Parke...

red shift

(Encyclopedia)red shift or redshift, in astronomy, the systematic displacement of individual lines in the spectrum of a celestial object toward the red, or longer wavelength, end of the visible spectrum. The effect...

Attis

(Encyclopedia)Attis āˈ– [key], in Phrygian religion, vegetation god. When Nana ate the fruit of the almond tree, which had been generated by the blood of either Agdistis or of Cybele, she conceived Attis. Later...

micrometer

(Encyclopedia)micrometer mīkrŏmˈətər, mīˈkrōmēˌtər [key]. 1 Instrument used for measuring extremely small distances. Typical examples are devices used in astronomical telescopes to measure the apparent d...

virtual observatory

(Encyclopedia)virtual observatory, a collection of integrated astronomical data archives and software tools that utilize computer networks to create an environment in which research can be conducted. Several countr...

virtual telescope

(Encyclopedia)virtual telescope, a computerized interferometer (see interference) that merges the images from two or more telescopes to obtain a single, large, enhanced image. The image in each telescope is made fr...

Ra, in Egyptian religion

(Encyclopedia)Ra rā [key], in Egyptian religion, sun god, one of the most important gods of ancient Egypt. Ra was chief of the cosmic deities and was sometimes called the creator and father of all things. Early Eg...

pendentive

(Encyclopedia)CE5 Pendentives pendentive, in architecture, a constructive device permitting the placing of a circular dome over a square room or an elliptical dome over a rectangular room. The pendentives, whic...