International Halley Watch

Systematic ground-based observations of 1P/Halley were coordinated by the International Halley Watch. The appearance of comets changes over a short period of time and continuous observations can help record these events. The International Halley Watch network of cooperating observatories and amateur astronomers from more than 40 countries enabled almost continuous recording of images and other data from the comet.

International Halley Watch Reporting Forms were distributed to assist in reporting observations to the International Halley Watch. Standard forms were used by observers in all parts of the world.