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XLV. The Transits of Versus and Mercury over the Sun's Disk, June 4 and Nov. 10, 1769, observed by John Maurits Mohr. Communicated by Captain James Cook. From the Latin. p. 433.
[ Read to the society in 1771; text reproduced from C. Hutton, G. Shaw and R. Pearson, The Philosophical Transactions of the Royal Society of London, from their Commencement, in 1665, to the Year 1800; abridged, with Notes and Biographic Illustrations..(London: C. and R. Baldwin, 1809), XIII, pp. 180-1.]
These transits were observed at Batavia in the East Indies, the observer being furnished with good instruments made by the best English artists, Shelton, Graham, Dollond, &c. Mr. M. used all the proper methods to rectify his instruments, to ascertain the rate of the clock, his true time, and the latitude and longitude of his observatory, which were, viz. 6° to south latitude, and 1O4° 30' longitude, east of Paris observatory. The cloudy sky however prevented any observations of the planet's passage over the solar disk; so that the exits only could be distinctly observed, which were as follow: viz. 1769.
June 4, Venus's exit, before noon, true time.
| Interior contact, or beginning of the exit.................................................... | 8h 30m 13s |
| Exterior contact, or the total exit............................................................... | 8 30 31 |
Nov. 10, Mercury's exit, before noon.
| Interior contact, or beginning of the exit..................................................... | 7 33 32 |
| Exterior contact, or the total exit................................................................ | 7 35 11 |