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Initiated in 1837 by Swathi Thirunal Rama Varma, Maharaja of the Kingdom of Travancore, the Trivandrum Observatory had strong links with Fellows of the Royal Society, as Hirra Ateeq discovers.

Jon Bushell looks at the Royal Society's portraits of Edmond Halley, and a diagram of Halley's curious model for the internal structure of the Earth.

The Royal Society's Edward Sabine correspondence is a treasure trove for research on everything from terrestrial magnetism to British activities in Africa, as Hirra Ateeq discovers.

Cataloguer Hirra Ateeq shares her discoveries from the terrestrial magnetism correspondence in the archives of the Royal Society, and tells the story of a remarkable Indian astronomer.

Archivist Virginia Mills examines Humboldt's role in establishing a network of magnetic observatories across the world, and his philosophy that everything in nature is interconnected.