28 July 2015
The International Astronomical Union, New Delhi 19.11.1985
The International Astronomical Union (IAU; Union astronomique internationale, UAI) is a collection of professional astronomers, at the PhD level and beyond, active in professional research and education in astronomy. It acts as the internationally recognized authority for assigning designations to celestial bodies (stars, planets, asteroids, etc.) and any surface features on them.
The XIXth IAU General Assembly was held in New Delhi on 19.11.1985. The Re1.00 stamp displays the Halley's Comet, and the Cover shows a drawing of the Sun and the Moon during an eclipse.