William Lilly approached work through three practical questions: what can your mind do, what do you enjoy, and what can you sustain through physical effort? He connected these with Mercury, Venus and Mars. Then he examined how the planets stood in the birth chart and how they connected with one another. For readers interested in their own working abilities, that gives each planet a distinct job before the interpretation gets complicated.
Mercury thinks, Venus enjoys, Mars keeps going
In Lilly’s Christian Astrology, published in 1647, Mercury represents mental abilities, Venus inclination or enjoyment, and Mars bodily endurance. Put into everyday working language, Mercury communicates and calculates. Venus brings taste and cooperation. Mars supplies effort and the drive to push ahead.
These distinctions matter. Enjoying a task, understanding it and having the stamina to carry it through are separate strengths. Anyone who has loved a design and then faced the work of making it will recognise the difference.
Lilly gave the planets individual treatment in his discussion of profession, alongside their combinations. A planet’s meaning began the reading; its condition and connections developed it.
Rhetorius gives the trio an earlier history
The same three planets appear in the older tradition preserved by Rhetorius the Egyptian. His Astrological Compendium, a late-antique compilation transmitted through the Byzantine tradition, includes sections translated as “Action and Pursuits”, “The Three Stars Signifying Actions” and “Trades”. Work received sustained attention across several sections.
Rhetorius and Lilly belong to different periods and different layers of astrological practice. Their shared interest in Mercury, Venus and Mars gives us a useful comparison, while their treatments remain distinct. Lilly’s neat division between mental ability, inclination and bodily endurance should stay attached to Lilly.
The common principle is clear: interpreting occupation requires several factors working together. The astrologer follows the planets beyond their basic meanings.
The sign changes how a planet works
A planet’s sign adds detail to its account of activity. In Lilly’s treatment, the sign helps describe the kind of work and its setting. Mercury’s association with mental ability is therefore a starting point, followed by a closer look at how that ability operates.
Rhetorius also distinguishes between a planet occupying its own sign and occupying a sign ruled by another planet. The sign’s ruler—the planet traditionally assigned authority over that sign—therefore becomes relevant to the reading.
This brings us to dignity: a planet’s strength according to its position in a sign. Lilly considered dignity alongside the planet’s wider placement and connections. Knowing what a planet represents and judging how strongly it can act are separate steps.
One task can put all three to work
Picture someone making a small wooden shelf. They calculate its dimensions and explain the plan, choose its proportions and finish, then cut, assemble and complete it. This is a present-day illustration of planetary symbolism, rather than an example taken from either author’s list of occupations.
Mercury handles the measurements and explanation. Venus shapes the appearance and helps the maker agree on the design with someone else. Mars gets the hands working and sustains the effort.
The finished shelf contains all three contributions. A single task makes their combination easier to grasp than three isolated job labels.
Strength and connections complete the working picture
Lilly’s discussion includes combinations of Mercury, Venus and Mars because abilities meet in practice. Communication works with taste; taste needs execution; effort benefits from calculation. Their aspects—the angular relationships between planets in a chart—help describe those connections.
When reading a traditional interpretation of your own work, look for that chain of reasoning. Which planet describes the ability? What does its sign contribute? How does its strength support its role, and which other planets join in? Those details explain why an astrologer has moved from a planetary name to a particular account of how you work.
