... Scale, Number Number Mean errors of code Observa- Focus FOV Cata- of minor of single observation tory (m) log planets positions RA DE --------------------------------------------------------------------------------- " " 104 Italy, San 0.40 21 x 21' 2.5" 1 3 0.025 0.020 Marccello 2.0 GSC 113 Germany, 0.50 13 x 10' 2" 1 5 0.213 0.230 Schonbrunn 2.3 USNO 122 France, 0.40 No data 4 19 0.418 0.319 Pises Obs. ... Cyprus 2.0 USNO B38 Santa Mama, 0.30 No data 3 9 0.394 0.160 Italy 3.0 USNO B40 Skylive Obs.,...

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... ARTICLE: The Adventurous Search For The Astronomical Unit . ... Kepler himself had suggested to use the rare occasions of Venus transiting (crossing) the solar disk to measure our distance to the planet. ... Due to the orbital inclination of Venus against the ecliptic of 3.5°, a Venus transit is so rare that it happens only at intervals of 121.5 years, 8 years, 105.5 years, 8 years and so on. ... Crabtree witnessing the transit of Venus 1639 . ... Transits of Venus - The Quest for the Solar Parallax...

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... 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...

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