Sri Lanka #785a Halley's Comet - 1986 Mint Sheet

After a 76-year absence Halley's Comet was visible to skywatchers in 1986. This colorful sheet shows historical references to the comet, its orbit and position in the sky, and astronomer Edmond Halley, who first plotted the comet's course 300 years ago. (Sri Lanka #785a)