By Seth Shostak

ISBN-10: 1426204337

ISBN-13: 9781426204333

Extraterrestrial beings are massive in the United States. even if they've arrived through rocket, flying saucer, or simple outdated teleportation, they've been invading, infiltrating, or inspiring us for many years, and they've involved moviegoers and tv watchers for greater than fifty years. approximately half us think that extraterrestrial beings quite exist, and hundreds of thousands are confident they've visited Earth.For twenty-five years, SETI has been searching for the facts, and because the program's senior astronomer, Seth Shostak explains during this engrossing publication, it's fullyyt attainable that ahead of lengthy conclusive facts should be found.His informative, pleasing document bargains an insider's view of what we would realistically anticipate to find light-years away one of the stars. Neither humanoids nor monsters, says Shostak; actually, organic intelligence is perhaps only a precursor to desktop beings, vastly complicated synthetic sentients whose services and accomplishments could have constructed over billions of years and...

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Example text

Use th e shado w plo t tha t yo u mad e fo r sectio n 1. 3 t o solv e th e followin g problems. 1. A t wha t cloc k tim e di d loca l noo n occur ? Connect th e point s o f you r shadow plo t b y a smooth curve . Try t o judge exactl y where th e shado w would b e shortest , an d estimat e th e tim e accordingly . 2. Whic h way is north? Use the bisection-of-the-angle metho d t o fin d out . Check to see that your north direction agrees fairly well with the direction of th e shortes t shadow . Als o dra w i n th e direction s south , east , an d west.

Th e Almagest is one of the greatest books in the whole history of the sciences—comparable i n it s significance an d influenc e t o Euclid' s Elements, Newton's Principia, o r Darwin' s Origin of Species. Ptolemy' s Almagest dominated th e stud y and practice of astronomy from th e time of its composition unti l the sixteenth century. Just a s Ptolemy influence d all who followe d him, s o to o h e tende d to displace his predecessors. The technica l works on mathematica l astronom y by hi s predecessor s cease d t o b e rea d an d copied , sinc e thei r result s wer e included in , o r supersede d by , Ptolemy' s work .

At first, these were translated into Lati n fro m Arabi c translation s o f th e Gree k originals . Onl y somewha t later wer e Lati n translation s mad e directl y fro m th e Greek . D . 1175 . I t wa s largely from thi s translatio n that European s learned thei r technica l astronom y fo r the nex t thre e hundre d years. B y the middl e o f the thirteent h century , European s were writing thei r own introductor y textbook s o f astronomy . Lati n version s o f a numbe r o f Arabic manuals were also in circulation.

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Confessions of an Alien Hunter by Seth Shostak


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