... In this chapter, we explore many different ways to measure and record time. ... Any proposed calendar must be compatible with observations (100-day years are contrary to observations!) ... Three-minute "hour glasses" to time eggs are still common in kitchens. ... How could we lengthen the amount of time it takes to empty one of the bottles? ... In the activities of Chapter 1, we found that midday, when the Sun is highest and directly South in the sky, rarely corresponds to noon, as told by the clock...

... Mark Abernathy, Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD, 21218, U.S.A. (abernathy@stsci.edu) . Alberto Accomazzi, SAO, 60 Garden Street, Cambridge, MA, 02138, U.S.A. (aaccomazzi@cfa.harvard.edu) . Nancy Adams-Wolk, SAO, Mail Stop 81, 60 Garden Street, Cambridge, MA, 02138, U.S.A. (nadams@head-cfa.harvard.edu) . ... 02138, U.S.A. (mo@cfa.harvard.edu) . ... Martin Zombeck, SAO, 60 Garden Street, Cambridge, MA, 02138, U.S.A. (mzombeck@cfa.harvard.edu) . ...

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... The chances of the Earth being hit by a comet from beyond Pluto — А la Armageddon — are much lower than previously thought, according to new research by an ANU astronomer. ... I calculate that small comets, capable of destroying a city, only hit the Earth once every 40 million years or so,” Dr Francis said. ... But asteroids and short-period comets come past again and again, so if we’re clever enough we can find them all and predict which, if any, will hit the Earth,” said Dr Francis. ...

Visitor Information and Housing Request . Please note: APO accommodations are not available to the public . Read this page carefully, and please submit this form 30-working days in advance of your arrival. ... When on-site accommodations are full, APO will assist you in obtaining off-site housing. ... To cancel an existing reservation, enter the name and arrival date and choose "cancel." ... Complete the name and arrival date in the fill-in form and select Cancel . ... Room #1/Dorm A . ...

Разработка, исследование и изготовление мощных полупроводниковых лазеров, излучающих в диапазоне длин волн 800 - 1800 нм. ... 30-летний опыт работы по разработке и изготовлению полупроводниковых лазеров . ... Диапазон длин волн - 800 - 1800 нм . ... Ознакомление с физическими и технологическими принципами работы мощных импульсных полупроводниковых лазеров с интегрированным тиристорным переключателем . ... Мощные импульсные полупроводниковые лазеры - физические основы и практическое применение . ...