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 63 Micron-determined Mass-Loss Rates in Young Stellar Objects
O I 8446 A emission in Seyfert 1 galaxies
O i and H i Emissions from the Upper Atmosphere of Venus
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 7774 Absorption as a Tracer of Streams and Disks in Non-Degenerate Binary Stars
O I lambda 8446 and NA I lambda 5893 in the quasar 3C 273
O I lines in the sun and stars. I - Understanding the resonance lines
O II forbidden line and continuum structure in radio-loud QSOs to Z = 0.09
O II Recombination Lines and Temperature Fluctuations in m8 and M17
O III - Intercombination and forbidden lines
O III line ratios in the sun
O Iiject{HD 152248}: Evidence for a colliding wind interaction
O illuminating the wires of telescopes