Virgo 20°-30° — the Seven of Pentacles

Mercury in Virgo

Mercury ruling the last decan of its own earth sign is analysis at its most material, and the Ten of Pentacles, Lord of Wealth, is the largest-scale card in the suit: three generations, a family compound, dogs, an old man at the edge of the scene that nobody is looking at. Mercury in Virgo makes this wealth structural rather than lucky - it was built and recorded. The decan reads for legacy, inheritance and the point at which prosperity stops being an individual matter.

Using this decan for timing

As a timing marker the Ten of Pentacles operates on a generational scale, which makes it unhelpful for short questions and excellent for long ones. Answering 'when', it points at something that will outlast the current arrangement - years rather than weeks.

Where it sits in Virgo

Virgo spans thirty degrees and divides into three decans, each with its own ruler and its own card from the Suit of Pentacles. This one is the closing ten degrees.

The sign as a whole is attributed to The Hermit in the Major Arcana — see why Virgo carries that card.