It said the meteors should become visible when the Gemini constellation rises above the eastern horizon at around 8pm. Viewing should remain good until about 2.30am, when moonlight may begin to interfere.
Most meteor showers originate from comets. However, the Geminids are unusual because their debris comes from the asteroid 3200 Phaethon.
Phaethon has an unusual, highly elliptical orbit that brings it very close to the Sun, causing it to shed rocky material that produces bright meteors. Some scientists refer to it as a “rock comet” or a “dead comet”.