... The classical Beltrami theorem says that any metric whose geodesics are straight lines has constant curvature. But what can we say about geometries whose geodesics are circles (to be more precise --- parts of circles; by a circle we always mean a circle or a line)? ... We prove that a rectifiable simple bundle of circles containing sufficiently many circles in general position is the image of a bundle of lines under some left or right quaternionic fractional transformation. ...

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250$ - Moscow Session (21-26 may) . 200$ - St.-Petersburg Session (27-30 may) . 400$ - both In Moscow (20-26 may): . RAS Resthouse "Uzkoe" - $50/day (3 time meals included) . In St.-Petersburg (26-30 may): . Circus Artists" Hotel, sharing double apartment (without meals) - $40/night. University Hotel single (no meals) - $45/night. ... Financial support Some restricted financial support is available. ...

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... 13 1000000000 2500000000 2000000000 500000000 1500000000 0 -1500000000 -1000000000 -500000000 0 500000000 1000000000 1500000000 1000000000 500000000 -500000000 0 -1500000000 -1000000000 -500000000 -1000000000 -500000000 0 500000000 1000000000 1500000000 -1500000000 -1000000000 2500000000 2000000000 1500000000 1000000000 500000000 0 -2000000000 -1500000000 -1000000000 -500000000 0 500000000 1000000000 -500000000 -1000000000 . ... 2012. ... URL: http://www.asc.rssi.ru/millimetron/millim.htm 8. ...

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... Observing . ... Astronomy for Kids . ... Astronomy enthusiasts fear losing access to Mauna Kea permanently . ... Night-sky lovers are worried that new rules aimed at protestors opposing construction of the Thirty Meter Telescope will permanently ban the public from visiting Mauna Kea at night. ... The group said it too feared the new rule would effectively bring an end to photographing Mauna Kea s starry skies. ... Only registered members of Astronomy.com are allowed to comment on this article. ...

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Midnight And Noon . Articles | ... Never call 12 Midnight, 12 a.m. Never call 12 Midnight, 12 p.m. Never call 12 Noon, 12 a.m. Never call 12 Noon, 12 p.m. Always refer to the 12 o'clock during the middle of the night as 12 Midnight . ... Hence to express the time from 12 noon to 12 o'clock at night, we use the term p.m. and from 12 o'clock at night to 12 o'clock noon we use a.m. However 12 o'clock midday is neither ante meridian or post meridian. ... www.astronomy.net . About Astronomy Net | ...

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The Heritage Society . Application Form . ... Please send me additional information about joining The Heritage Society and my giving options. I have already included the ASP in my will or estate plan and would like to join The Heritage Society. ... Address . ... The Astronomical Society of the Pacific is an international, non-profit scientific and educational organization founded in 1889 that works to increase the understanding and appreciation of astronomy. back ...

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... Observing . ... Home Observing Lincoln Center Lincoln Center Observing Schedule . ... Clear Sky Chart . ... Lincoln Center . ... Beyond New York City . ... Observing Resources for Amateur Astronomers - Part 1: Beginning Observers . Observing Resources for Amateur Astronomers - Part 2: Intermediate Observers . ... A History of the First Forty Years of the Amateur Astronomers Association . ... 2016 Amateur Astronomers Association of New York Designed by Press Customizr Powered by . ...

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... Previous: Filtering KPNO LaTeX Observing Proposals with Perl . ... The Planning and Scheduling Tool was designed allow the user easily to take advantage of all available resources of the four telescopes (LASCO's three coronagraphs and the EIT Telescope) to maximize the use of the telemetry downlink. The Planning Tool allows users to develop customized observing sequences while monitoring compression factors and on-board processing times to realistically work within the limits of the instruments. ...

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... NASA Integrated Services Network (NISN) . ... NASA NISN Security Policy . ... Incidents Of Misuse and abuse of the NASA Integrated Services Network by hackers or overly curious network users have necessitated certain limitations to be imposed in order to ensure the continued security and integrity of the network. ... Use of the NASA Integrated Services Network to gain unauthorized use of resources attached to the NASA Integrated Services Network may result in disconnection and legal prosecution. ...

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Russian SHAREABLE DATA CENTER Institute of Solar-Terrestial Physics SB RAS . ... Chirp ionosonde main technical characteristics . ... Linear frequency modulated continuous signals sounding method is relatively simple and has wide application in various special-purpose systems. ... Chirp signals which are applying for ionosphere channel diagnostics usually have10KHz/s -- 1MHz/s. We must point out that under modulation speed increasing there is an increase in noise suppression and resolution power. ...

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... Bad Astronomy . ... Bitesize Astronomy . ... Keep Bad Astronomy close to your heart, and help make me filthy rich. ... It's semi-common knowledge that stars twinkle and planets don't. By semi-common, I mean that a lot of folks know that, but I also mean it isn't strictly true. Stars twinkle because we see them from the bottom of a sea of air. ... These small bundles of air act like little lenses, bending light as it passes through them. ... What we see is the light from the star flickering. ...

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... Space flight . ... Baikonur . ... Space camp . Space Hotel . ... On-line Data . ... Launch date . ... Description . Services / Baikonur: General description Technical description Shedule of launches Photo gallery Price . Info: Industry news On-line Data Company ATLAS news Events We in press Contact . Copyright 2000-2016 ATLAS Aerospace . ...

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... ISC Kosmotras . ... Comments, Opinions Publications Dnepr Program . Dnepr launch record 17 August 2011. ... The success of PICARD launch re enforces our high level of appreciation of the quality of the DNEPR launcher and of the professionalism and efficiency of ISC Kosmotras. ... The distinguishing feature of the THEOS launch by a converted SS-18 ICBM (Dnepr LV) is that it was the first ISC Kosmotras mission from the Yasny launch site that headed southward to its Sun-synchronous target orbit. ...

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... Satellite data ] . SMIS ] . ... NOAA satellites . Telemetry Data Format . ... METEOR-3M Satellite Pass Schedule . Telemetry Archive Catalog . Last telemetry files . ... Data Processing Examples . ... Caspian Sea (server "SPUTNIK") . GOMS satellite (server "SPUTNIK") . Archive Directory . Latest Data . ... RESURS 01 satellite (server "SPUTNIK") . Operational Archive (MSU-E Data) . ... METEOR satellite (server "SPUTNIK") . ... OKEAN satellite (server "SPUTNIK") . ...

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