Charubel's image for this degree is dated by its own parenthesis: a comet, like the one in 1882. He means the Great September Comet, which his readers had seen with their own eyes, one of the brightest of the nineteenth century, visible beside the sun at noon and trailing fire across the southern sky for weeks. The aside matters, because it makes the emblem not a generic omen but a remembered event, spectacle vouched for by witnesses.
Comets are the sky's exceptions. Planets keep their courses and their appointments; a comet arrives from outside the familiar order, blazes against every fixed arrangement, and leaves, and for most of human history it was read exactly so, as the announcement that the settled pattern does not exhaust reality, herald of change, terror of kings. Astronomy's revision deepens rather than deflates the symbol: comets do belong to the system, on orbits so long and eccentric that a lifetime sees each one once, order operating at a scale that looks like disruption to short-lived observers.
Read against the eighth degree of Scorpio the image marks the visitation, the passion, crisis, person or revelation that crosses a life once, transforms its sky, and cannot be scheduled or retained. Scorpio's instinct is to grasp and keep; the comet is the unkeepable, and the degree's teaching is how to be visited, fully attentive, unclutching. The shadow is twofold, the life spent waiting for the next apparition, and the blazing thing itself mistaken for a permanent fixture. On a natal Uranus-touched point or the eighth house this degree tends to mark rare, searing transits of experience, and its counsel is the astronomer's: record it exactly, let it change your cosmology, and do not build your calendar on its return.