The Orionid meteors are debris from Halley’s comet. Every October they become visible for several nights when the Earth intersects Halley’s orbit. At peak, if the night is dark and cloudless, up to 70 meteors an hour can be seen. This year, prime viewing times are likely to be the nights of October 20, 21, and 22 – Friday, Saturday, and Sunday – although they are likely to remain visible, if less frequent, as late as November 7. The best times are between 2am and 5am.