O the approaching return of Halley's comet
O the Astronomy of Oracle Bone Inscriptions
O the Balancing of Equatorial Telescopes
O the calculation of geographical longitude, &c.
O the calculations of eclipses and occultations
O the Cape mural circle
O the comet discovered at Marseilles, in the constellation of Equuleus, April 21, 1830
O the comet of Halley, with elements for 1759 and 1835
O the computation of observed occultations with parallax
O the constant of Lunar nutation
O the construction of large achromatic telescopes
O the construction of the hour-lines of sun-dials
O the December solstice of 1827
O the declinations of the principal fixed stars
O the dependence of a clock's rate on the barometer
O the Derivation of the Stratification of Solar Vector Magnetic Fields by Stokes Profile Analysis
O the deviations of the transit instrument
O the deviations of the transit instrument
O the difference of longitude between Greenwich and Paris
O the Discrepancy of Coronal Magnetic Fields in Solar Optics and Radio