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altitude

(Encyclopedia)altitude, vertical distance of an object above some datum plane, such as mean sea level or a reference point on the earth's surface. It is usually measured by the reduction in atmospheric pressure wit...

United States Naval Observatory

(Encyclopedia)United States Naval Observatory, a federal astronomical observatory, located in Washington, D. C. It evolved from the Navy's oldest scientific institution, the Depot of Charts and Instruments, founded...

seeing

(Encyclopedia)seeing, in astronomy, the clarity with which stars and other celestial objects can be observed. It is primarily determined by the atmosphere of the earth. The most obvious phenomenon is twinkling, whe...

Chaos

(Encyclopedia)Chaos kāˈōs [key], in Greek religion and mythology, vacant, unfathomable space. From it arose all things, earthly and divine. There are various legends explaining it. In one version, Eurynome rose ...

Joint Chiefs of Staff

(Encyclopedia)Joint Chiefs of Staff, U.S. statutory agency, created in 1949 within the Dept. of Defense. The chairman is the principal military adviser to the President, the National Security Council, and the Secre...

Plücker, Julius

(Encyclopedia)Plücker, Julius yo͞oˈlyo͝os plüˈkər [key], 1801–68, German mathematician and physicist. He became professor of mathematics (1836) and of physics (1847) at the Univ. of Bonn. He is known for h...

Musk, Elon

(Encyclopedia)Musk, Elon ēˈlŏn [key], 1971–, American business executive and entrepreneur, b. Pretoria...

Koolhaas, Rem

(Encyclopedia)Koolhaas, Rem (Remmet Lucas Koolhaas), 1944–, Dutch architect, b. Rotterdam. He began his career as a journalist and screenwriter, moving to London in the late 1960s to study architecture. Koolhaas ...

Sun Ra

(Encyclopedia) Sun Ra, 1914-1993, African-American jazz composer, bandleader, and keyboard player, b. Birmingham, Al., as Herman Poole Blount. Sun Ra was a leading c...