1761 - Jeremiah Dixon served as assistant to Charles Mason, when the Royal Society selected Mason to observe the transit of Venus from Sumatra.
- Dixon returned to the Cape once again with Nevil Maskelyne's clock to work on experiments with gravity.
1763 - Dixon and Mason signed an agreement with the proprietors of Pennsylvania and Maryland, Thomas Penn and Frederick Calvert, seventh Baron Baltimore, to assist with resolving a boundary dispute between the two provinces.
- They arrived in Philadelphia in November and began work towards the end of the year.
1766 - The survey was not complete, following which they stayed on to measure a degree of Earth's meridian on the Delmarva Peninsula in Maryland, on behalf of the Royal Society.
1768 - Before returning to England, they were both admitted to the American Society for Promoting Useful Knowledge, in Philadelphia.
1769 - Dixon sailed to Norway with William Bayly to observe another transit of Venus.