INTIHUATANA - Inca Solar Observatory. The stamp shows the Intihuatana of Machu-Picchu, an Sundial or Sun Clock. It was used by the Incas to measure the movements of the sun, solstices and equinoxes for agricultural and religious purposes.
Australia 50th Anniversary of the Apollo 11 Mission to the Moon July 16, 2019 Set of four, one stamp shows radio telescope at Parkes Observatory, New South Wales.
Great Britain Royal Observatory Greenwich June 12, 2025 Set of ten, two stamps show Great Equatorial Telescope installed in 1893 and Annie Maunder Astrographic Telescope installed in 2018.
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