witching hour

In stock market terms it refers to the closing of the market (see double witching hour and triple witching hour).

Also a movie or two, a band, many books, websites, comics, and more. Seems to be a very popular name.

Witches refer to hour of midnight being the witching hour only when it is on the night of a full moon. It is considered to be a time of transformation and change, with the witches ability to cast a spell considered to be at its height.

The idea that the moon affects whatever witchy thing is being done comes from ancient times when Goddesses associatted with fertility, witchcraft and the moon were worshipped.The notion was that as the moon waned and waxed its powers (and that of the deities) did, culminating at the full moon. Over time, this has changed to the thought that a witches power is affected.

Amateur spell books (the kind that claim you can turn your ex-boyfriend into a toad, or make yourself instantly attractive to the opposite sex) recognise the link between the witching hour and the publics idea of what a spell is, and often include the note 'For best results, perform spell at witching hour, preferably skyclad'. For best results, go outside at the witching hour and torch the book.

If a job is scheduled during the 'witching hour' - the time during a change from the main to alternate time zone, the job will either be run once (if the actual time exists twice) or not at all (if the actual time never exists).

If my hazy memory is correct, the Unix guys used to call and the hour that never happens (spring forward) the 'devils hour', and the hour that happens twice (spring forward, fall back) the 'witching hour'.

Of course, neither of these have anything to do with the Pagan/Wiccan tradition of the witching hour, which is typically midnight every night.