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What observations did Edmond Halley make on St. Helena?
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Edmond Halley
Edmond Halley, detail of an oil painting by Richard Phillips, c. 1720; in the National Portrait Gallery, London.
During his expedition to the island of St. Helena between 1676 and 1678, Edmond Halley conducted several significant scientific observations:
- Stellar Mapping: He recorded the celestial longitudes and latitudes of 341 stars, which resulted in the first star catalog to provide telescopically determined locations for stars in the Southern Hemisphere.1
- Astronomical Phenomena: He observed a transit of Mercury across the Sun’s disk.1
- Stellar Changes: He noted that certain stars appeared to have become fainter since they were recorded in antiquity.1
- Physical Measurements: He performed numerous pendulum observations.1
These efforts established Halley's reputation as a prominent astronomer and led to his election as a fellow of the Royal Society upon his return.1