METEORITEORIGIN OF ELEMENTSBIOGRAPHY: JOHN DALTON English, 1766–1844NATURAL ELEMENTSSYNTHETIC ELEMENTSFIND OUT MOREThe enormous variety of matter around you is made from different combinations of…
You will often hear astronomers refer to the brightness of an object in terms of an objects apparent magnitude.
The term apparent magnitude refers to a star's apparent brightness, or how bright the…
(Encyclopedia) Reclus, Jean Jacques ÉliséeReclus, Jean Jacques ÉliséezhäN zhäk ālēzāˈ rəklüˈ [key], 1830–1905, French geographer, b. Gironde, educated mainly in Germany, where he studied under Karl…
(Encyclopedia) EratosthenesEratosthenesĕrətŏsˈthənēz [key], c.275–c.195 b.c., Greek scholar, b. Cyrene. A pupil of Callimachus in Athens, he became (c.240 b.c.) head of the library at Alexandria.…
(Encyclopedia) node, in astronomy, point at which the orbit of a body crosses a reference plane. One reference plane that is often used is the plane of the earth's orbit around the sun (ecliptic).…
(Encyclopedia) shaft sinking, excavation from the surface of an opening in the earth. Shafts, which are generally vertical, are usually distinguished from tunnels, which are horizontal. Little…
(Encyclopedia) universal time (UT), the international time standard common to every place in the world, it nominally reflects the mean solar time along the earth's prime meridian (renumbered to…
(Encyclopedia) synodic periodsynodic periodsĭnŏdˈĭk [key], in astronomy, length of time during which a body in the solar system makes one orbit of the sun relative to the earth, i.e., returns to the…
Dad, Can I Borrow Your Car?Classical MythologyNot in Our Stars: Tragic Heroes and Their FatesSwitchblade SistersMutual Mistrust: The High Cost of JealousyThe Limits of CraftsmanshipDad, Can I Borrow…
(Encyclopedia)
CE5
Equatorial coordinate system
equatorial coordinate system, the most commonly used astronomical coordinate system for indicating the positions of stars or other celestial…
