The astrology of the recent terror alert across UK airports is vast and complex but the news of the travel chaos it created for individuals struck me that there were at least two days to go before the end of the shadow phase of the current Mercury retrograde. Reminding us surely that while the outer planets danced their slow but resonant rhythms round worldly events, there’s also the little guy stuck in a queue for four hours.

Eric Francis also reckons we might want to consider echoes across retrograde periods, and look at events across time when a retrograding planet crosses the same degree it did before. I don’t have the resources at the moment to pursue this, but it’s something to keep in mind.