  Coins of Armenian king Tigranes II the Great (95-55 BC), silver and
copper-bronze tetradrachms and drachms, clearly reveal a star with a tail on
the royal tiara which may be associated with the Halley's comet passage of 87
BC. If so, one has another case when astronomical events can be useful for
historical chronological problems, this would be a far earlier record of Halley
in Armenia than was previously known from chronicles and also one of the
earliest known images of Halley's comet.
