The Moon is Void of Course if she does not perfect another aspect before leaving her present sign or if there is a great distance to travel to perfect an aspect while still in her current zodiacal sign. We limit Void of Course to the Moon but it is really applicable to any planet, and mostly we mean that it doesn't perfect another aspect before leaving the current sign.

Much hype surrounds the Void of Course Moon and its symbolism. The ancient texts tell us that when a Moon is VoC, matters go hardly on and today, the word ‘hardly' is synonymous with ‘scarcely'. This is a corruption of meaning. In the past, hardly meant exactly what it says. It is the adverb formed from hard, and so meant ‘in a hard way'. What Lilly says about the void of course Moon is ‘things go hardly on'. Modern writers, thinking hardly means scarcely, have taken this to mean that nothing will happen: things scarcely move. What Lilly intended is ‘things go on in a hard way', so things proceed with difficulty.

Of course, if things proceed with difficulty people often give up, either through a failure of will or the realisation that the prize is not worth the candle, so this can amount to the same thing, but it's not what Lilly meant. (Reference: John Frawley – Craftsman Astrologer tuition)

The Moon is VoC at least once a day when she changes sign (ingress) and the world does not come to a grinding halt each time she is VoC. In a horary question the Moon being VoC can indicate difficulty or stagnation with regards to the question posed and it is up to the people involved in the event to decide whether or not they can overcome the difficulties presented to them; and like any other single testimony, it can be over-ruled: it is not an answer in itself, as some modern texts would suggest.