O Ensino de Astronomia: Desafios para Implantação
O errors in logarithmic tables
O errors in the declinations of Jupiter in the Connaissance des Tems, 1831
O errors in the places of the planet Ceres in White's Ephemeris, 1830
O finding the longitude
O finding the time by two stars on the same vertical
O Flamsteed's observations
O Fraunhofer's telescope
O I (7990 A) emission and radiative entrapment of auroral EUV
O I /7774 A/ and O I /8446 A/ emissions in aurora
O i 63 Micron-determined Mass-Loss Rates in Young Stellar Objects
O I 630.0-nm dayglow in the region of equatorial ionization anomaly - Temporal variability and its causative mechanism
O I 8446 A emission in Seyfert 1 galaxies
O i and H i Emissions from the Upper Atmosphere of Venus
O I and N2(+) emissions in polar auroras in daytime
O I concentration in Comet Halley
O I Fluorescene in Symbiotic Stars and Novae
O I lamba 7774 absorption as a tracer of streams and disks in nondegenerate binary stars
O I lambda 7773 absorption in optical counterparts of X-ray sources
O I lambda 7774 Absorption as a Tracer of Streams and Disks in Non-Degenerate Binary Stars