Top vacation destinations for g., Halley’s Comet in AD , and the Great Comets of and or western e.g., the Great Comets of , and horizon as they separate from the Sun in the aftermath of perihelion. When a comet does this, it is a heliacal rising. Such risings may be very striking, because comets are at their most impressive around perihelion time they are at their brightest, longest, largest, and fastest. Indeed no other entity’s heliacal rising can compare in majesty to that of a great comet speeding away from the Sun immediately after its closest encounter with it. Top vacation destinations 2016.