Unity Rupes (Mercury)
English vessel which took Edmond Halley to Saint Helena in 1676 to conduct a survey of the stars in the southern hemisphere. While there, Halley observed the 1677 transit of Mercury which enabled him to make one of the earliest calculations to estimate the size of the solar system.
A rupes is a scarp. On Mercury they are named after ships of discovery or scientific expeditions.
Image Source. Marker locations are approximate and may not always appear to align with image on map.
Unity Rupes
27.06° N 84.88° E