A Voyage Around the World in 1766- 1769, with charts

Pacific Ocean -- Discovery and exploration -- Maps. Indeterminable Notes English edition ; uncoloured; at top of map: I face page 1. A digital copy is available at. Terms of Use You are free to use the digitised content without permission.

Bougainville, Louis-Antoine de comte 1729-1811

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Lists What are lists? The viewing of the transit involved the effort of observers from nine nations.

Carteret's Voyage Round the World 1766-1769 (two volumes)

He alerted the Royal Society in that preparations needed to begin for the transit. When choosing a location for viewing the transit, The Royal Society basically chose the locations Halley suggested in his article. The committee recommended that the transit be observed from three points: They stated that two competent observers were to be sent to each location. He allocated pounds for the society to help with the expenses. Wallis returned from his voyage in time to help the Royal Society decide that it would be an ideal location to observe the Transit of Venus.

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A big advantage was that Tahiti was one of the few islands in the South Pacific that they knew the longitude and latitude of. The Admiralty was not really interested in particularly where in the South Pacific the observation of the Venus transit would take place. They were more interested in the "secret" mission that would be revealed after the Venus transit observation: James Cook was commissioned as Lieutenant and appointed to command the vessel.

Once the Endeavour arrived on the island, Cook decided to set up the Venus transit observatory on shore. He required a completely stable platform which the ship could not provide and plenty of space to work with.

The location of the observatory would be known as "Fort Venus. They marked a perimeter and construction began. It had earthworks on three of its sides adjacent to deep channels. Wood was gathered to construct palisades that topped the earthworks. Casks from the ship were filled with wet sand and used for stability.

First voyage of James Cook

The east side of the fort faced the river. Mounted guns were brought in from the ship. A gateway was assembled and within this fortification, fifty-four tents were pitched which housed the crew, scientists, and officers as well as the observatory, blacksmith equipment and a kitchen.

John Gore led another group of thirty-eight more on a neighboring island of Eimeo Moorea. Both parties were briefed and supplied with the needed equipment. The observers were ordered to record the transit in four phases of Venus' journey across of the sun. The first phase was when Venus began "touching" the outside rim of the sun.

In the second phase, Venus was completely within the sun's disc, but was still "touching" the outer rim. In the third phase, Venus has crossed the sun, was still completely within the disc, but was "touching" the opposite rim. Finally in the fourth phase, Venus was completely off the sun, but was still "touching" its outer rim. On the day of the transit, the sky was clear. Independent observations were made by James Cook, Green and Solander with their own telescopes.

The next transit would not occur until Solander observed as well as Mr.

Bougainville, Louis-Antoine de comte [WorldCat Identities]

Green and my self, and we differ'd from one another in observeing the times of the Contacts much more than could be expected. Mr Greens Telescope and mine were of the same Magnifying power but that of Dr was greater than ours. Recording the exact moment of the phases proved to be impossible due to a phenomenon called the " Black drop effect. Recent studies now reveal that it is actually turbulence in the Earth's atmosphere that leads to the smearing of the image of Venus.