Two of the actors in Apple's Silo have birthdays this week, three days apart. Tim Robbins was born on October 16, 1958, and Rebecca Ferguson on October 19, 1983. Both are Libras. If the Sun sign were the whole story, that would be the end of the comparison.
It isn't. Put their charts side by side and Libra turns up in different planets for each of them, while their Venus and Mars head off in completely different directions.
Where we met them
According to Apple's press releases for the show's 2023 launch, Silo is based on Hugh Howey's novels and was created by Graham Yost. Ferguson leads the ensemble as Juliette, an engineer, and is also an executive producer. Robbins is named in the same ensemble cast, and both attended the London world premiere in April 2023. That shared show is the only connection this piece relies on; it's a comparison of two co-stars' charts, not a story about them.
What we can compare
Ferguson has no recorded birth time in our catalogue. Robbins has one, but to compare like with like we use the same rule for both: only placements that hold across the whole local birth day. That means no rising signs and no houses for either. Ferguson's Moon also changed sign during her birth day, so it stays open; Robbins's Moon stays in Sagittarius all day. Everything below is a symbolic reading of planetary positions, not a claim about either person's private life or how they work.
Same Sun, different Libra
Tim Robbins: Sun and Venus in Libra. His Mercury sits right on the Libra/Scorpio boundary and crosses it during his birth day, so we don't settle it. Mars is in Gemini, and retrograde.
Rebecca Ferguson: Sun and Mercury in Libra. Her Venus and Mars are together in Virgo, about two degrees apart all day.
So the Libra emphasis falls on a different planet in each chart. In Robbins's, it's on Venus, the planet astrologers associate with taste and what you value. Venus is at home in Libra, one of the two signs it rules, and it's traditionally read there as a strong sense of proportion and fairness, of what looks and feels right.
In Ferguson's, it's on Mercury, the planet of thinking and speech. Mercury in Libra is read as a mind that weighs both sides, listens before answering and looks for the phrasing that keeps a conversation open.
Venus and Mars: air and earth
The bigger contrast is in how each chart is read to want and to act.
Robbins's Mars in Gemini is an air placement: drive that moves through ideas, talk and curiosity. Retrograde Mars is traditionally read as energy that turns inward first and reconsiders before it commits. Paired with a Libra Venus, it's a chart that astrologers would describe as led by ideas and principles.
Ferguson's Venus and Mars together in Virgo is an earth pairing: wanting and doing joined in the same practical, detail-minded sign. Virgo is read as craft, precision and getting the small things right. Her Venus is also in an almost exact square to Jupiter, a contact read as appetite for scale meeting Virgo's instinct for care.
Air and earth, ideas and craft: that's the real difference between these two Libras, and the Sun sign alone would hide it.
Try it with your own chart
If you share a Sun sign with someone, put your Mercury, Venus and Mars signs next to theirs. The planet that carries your shared sign, and the elements of your Venus and Mars, will usually tell you more about how you differ than the Sun ever will.
For another actor's chart read the same date-only way, see Hannah Dodd's birth chart, from Bridgerton.
For the full placements behind this piece, see Tim Robbins's birth chart and Rebecca Ferguson's birth chart. Each profile can compare its chart with yours.
To see what a full written interpretation looks like, read the complete fictional sample reading. If you want one for your own chart, there's an optional, paid personal birth chart reading. It's an automated symbolic interpretation, not a consultation or a prediction, and the price for your country is shown before you decide.
Sources: Apple TV Press, first-look and premiere-date press release, March 6, 2023, for the cast, creator, source novels and Ferguson's role and producer credit; and world-premiere press release, April 25, 2023, for the London premiere. Paraphrased; no quotes, stills or plot details. Birth dates and places come from Lunara's existing profiles; positions were calculated with Lunara's central Swiss Ephemeris path, sampled hourly across each local birth day. Written with AI assistance and edited by Lunara; the illustration is original.