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in the Gregorian calendar: any year divisible by 4 except centenary years not divisible by 400 366 days , bissextile year , intercalary year , leap year
advanced level of a subject taken in school (usually two years after O level) A level
(astronomy) the magnitude that a star would have if it were viewed from a distance of 10 parsecs (32.62 light years) from the earth absolute magnitude
Arabian physician and influential Islamic philosopher; his interpretation of Aristotle influenced St. Thomas Aquinas; writings on medicine were important for almost 500 years (980-1037) Abu Ali al-Husain ibn Abdallah ibn Sina , Avicenna , ibn-Sina
extinct small mostly diurnal lower primates that fed on leaves and fruit; abundant in North America and Europe 30 to 50 million years ago; their descendents probably include the lemurs; some authorities consider them ancestral to anthropoids but others co Adapid , Adapid group
included seven times in every 19 years Adar Sheni , Veadar
extinct primate of about 38 million years ago; fossils found in Egypt Aegyptopithecus
widely cultivated American monocarpic plant with greenish-white flowers on a tall stalk; blooms only after ten to twenty years and then dies Agave americana , American agave
chronological tally of one's years age
from 405 million to 345 million years ago; dominance of fishes and appearance of amphibians and ammonites Age of Fishes , Devonian , Devonian period
approximately the last 63 million years Age of Mammals , Cenozoic , Cenozoic era
last 2 million years Age of Man , Quaternary , Quaternary period
from 230 million to 63 million years ago Age of Reptiles , Mesozoic , Mesozoic era
time in life (usually defined in years) at which some particular qualification or power arises age , eld
younger than one's years, condition of looking agerasia
Mexico's most famous tree; a giant specimen of Montezuma cypress more than 2,000 years old with a girth of 165 feet at Santa Maria del Tule Ahuehuete , Tule tree
Austrian general who fought for the Hapsburgs during the Thirty Years' War (1583-1634) Albrecht Eusebius Wenzel von Wallenstein , Wallenstein
Scottish sailor who was put ashore on a deserted island off the coast of Chile for five years (providing the basis for Daniel Defoe's novel about Robinson Crusoe) (1676-1721) Alexander Selcraig , Alexander Selkirk , Selcraig , Selkirk
tiny (150 to 300 grams) extinct primate of 46 to 50 million years ago; fossils found in Algeria; considered by some authorities the leading candidate for the first anthropoid Algeripithecus minutus
double star 15.7 light years from Earth; the brightest star in the Aquila constellation Altair
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