Of the geographical situation of the three Presidencies, Calcutta, Madras, and Bombay, in the East Indies

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From an extended series of observations of the eclipses of Jupiter’s satellites, corrected for the difference of the tables from the observations taken at Greenwich, at or about the time of each eclipse, the mean longitude of the Observatory at Madras is 80° 17' 21" E., and the mean latitude found by meridional observations of the sun and stars north and south of zenith, taken with the sextant, circular instrument, and zenith sector, is 13° 4' 9" N. By a series of corresponding eclipses of Jupiter’s satellites, taken at Fort William, the longitude of the Fort appears to be 88° 23' 39" E.