... A non-linear relationship is observed between the sky brightness on clear and overcast nights, with a change in behavior near the rural to urban landuse transition. ... The great variation in skyglow radiance observed from site-to-site and with changing meteorological conditions underlines the need for a long-term international monitoring program. he introduction of artificial light has caused an unprecedented disruption to the nighttime environment over large areas of the Earth. ... Data processing...

Optical Observatories . ... National Optical Astronomy Observatories . ... Adam Mickiewicz University - Astronomical Observatory . ... Astronomical Institute and National Observatory of Athens . ... Jagiellonian University Astronomical Observatory - Scientific research here comprises radio and extragalactic astronomy, solar radio emission, active galactic nuclei, interstellar matter, galaxies, cosmology, variable stars and comets. ... National Radio Astronomy Observatory Home Page . ...

... At present, SDSS (ugriz), UKIRT WFCAM (YJHK), ; Johnson-Cousins (UBVRcIc), and 2MASS (J2H2Ks2) ; are supported ; redshift - redfshift of a galaxy ( floating point) ; colour_name - colour identification (string) ; colour_value - value of colour in magnitudes ( floating point) ; should be in the AB mags for ugrizYJHK ; and in Vega mags for Johnson-Cousins/2MASS colours ; ; RETURN VALUE: K-correction in the specified filter for given redshift ; and ...

Электронная библиотека астронома-любителя. ... Ru.Space.News: . Декабрь 1998 . ... Дата: 10 декабря 1998 (1998-12-10) От: Alexander Bondugin Тема: New View Of Mars' North Pole Reported In Science Привет всем! ... Дата: 10 декабря 1998 (1998-12-10) От: Alexander Bondugin Тема: Launch Of One Mars Mission And Results From Another Featured On NASA T Привет всем! ... Дата: 10 декабря 1998 (1998-12-10) От: Alexander Bondugin Тема: NASA Invites You to Name Deep Space 2's Twin Microprobes Привет всем! ...

MICROSCOPES . ... NIGHT VISION DEVICES . ... OEM OPTICAL COMPONENTS . ... LOMO® has designed and manufactured optical devices ranging from microscopes and endoscopes to telescopes and night vision devices . ... Since the end of the Cold War LOMO ® has been able to continue its tradition of quality and innovation by offering its diverse products and technologies to the scientific, medical, industrial and educational communities in North America. ... LOMO PLC has received the ISO 9001 Certificate . ...

The Second U.S. Naval Observatory CCD Astrograph Catalog ( UCAC2 ) Table of Contents 1) Introduction 2) Summary of the Project a) Observations and Instrumentation b) Reductions of UCAC Observations c) Computation of Proper Motions 3) Properties of the Catalog and Important Notes For the User a) Sky Coverage b) Completeness c) Positions, Proper Motions and Error Calculations d) UCAC2 Magnitudes e) 2MASS Photometry f) Non-stellar ... All stars in the UCAC2 have proper motions. ...

НОВОСТИ ФЕДЕРАЦИЯ ЭНЦИКЛОПЕДИЯ ИСТОРИЯ СТАНЦИЯ МИР ENGLISH . ... Мои публикации . ... Perelman's activity in popularising science began at school when in September 1899 he published an essay entitled 'Concerning the fiery rain being expected' in the newspaper Grodneriskiye guberniskiye vedomosty under the pseudonym 'Y.P.' The widely spread rumours about the advent of Doomsday - with the exact date even fixed as 1st November - were the reasons for his publication. ... А.Железняков , 1997-2002. ...

... Home Lectures Lecture Series 2015-2016 . ... Lecture Series 2014-2015 . ... Beyond New York City . ... The Amateur Astronomers Association is proud to present an astronomy lecture series from October through May each year for our members and the public. ... Amateur Astronomer Association is pleased to announce we will be offering select, limited reserved seating for current AAA members for the Friday, January 8, 2015 AAA Lecture entitled Robert Nemiroff ?2015 Astronomy Picture of the Day?. ...

... Brian Simpson Observatory (609) 737-2575 (Director, continued from page 1) past year, the contributions of many club members stand out. ... And perhaps the most "quintessential" piece of AAAP, our monthly astronomy lecture program at Peyton Hall, maintained its very highest level of excellence, thanks to the fine work of Ken Kremer, Program Chair. THANKS to all members who helped make AAAP in 2006 one of the best amateur astronomy clubs in the country. ...

... Ассоциация была создана в 2002 году астрономами-любителями: . ... Астрономией интересуюсь с 1997 года: визуальные наблюдения планет Солнечной системы и их спутников, затмений, история астрономии.) ... Обновление от 1 августа 2008: видео затмения . ... 25 сентября 2005: В результате компьютерного моделирования Михаил Маслов (Новосибирск) делает прогноз метеорной активности для метеорных потоков Драконид и Леонид 2005 года: . ... Гелиос рекомендует: Дом из сэндвич панелей . ...