What Juno is in a birth chart
Juno is a main-belt asteroid, and the third one ever discovered. It is not a planet and it is not a calculated point like the Ascendant: it is a real body, 234 kilometres across, found in 1804 and named after the Roman goddess of marriage.
The traditional reading links it to commitment and to agreement — what a person expects from a partnership, and what they count as a breach of contract. It is a relatively new school's reading, and that is worth knowing: Juno entered charts when asteroids became easy to calculate, and not before.
This site calculates Juno and shows its position. And before any interpretation, there is something that has to be said — and that almost no site showing Juno says.
The Juno on this site is approximate, and here is by how much
Juno's position here comes from a two-body Keplerian propagation. The calculation takes the orbital elements at one instant — 24 February 2023 — and projects the ellipse forwards and backwards, as if only Juno and the Sun existed.
Except that Jupiter exists. A main-belt asteroid is pulled by it constantly, and a fixed ellipse does not know that. The error builds up the further you get from the starting date.
Measured against the Swiss Ephemeris across 524 charts from 1900 to 2030, this calculation:
| How much it is off by | In degrees | In days of Juno |
|---|---|---|
| average deviation | 1.48° | 6.6 days |
| worst case | 8.62° | 38.2 days |
And the sign comes out wrong in 3.6% of charts. One in twenty-eight. This site's answer marks Juno as approximate because of that, and the note travels with the point — it is not hidden in a footer.
Why it is not fixed: the fix is an ephemeris table, like the one Chiron already has here. Juno's would be six times bigger, because Juno goes round once every 4.36 years and Chiron takes fifty. It is work, and it has not been done yet.
Where the error bites: the sign boundaries
An error of 1.48 degrees changes almost nothing in the middle of a sign. It changes everything near the edge — and Juno spends more time near an edge than intuition suggests:
| Juno is less than | From a sign boundary |
|---|---|
| 1.48° (the average deviation) | 9.9% of the time |
| 8.62° (the worst case) | 58.1% of the time |
The 3.6% of wrong signs and the 9.9% near a boundary are the same phenomenon seen from two sides. The error only swaps the sign when Juno was already close to the edge and the deviation points the right way — which is why the error rate is lower than the proximity rate, and why the two measurements agree.
The practical reading: if your Juno sits in the first or last degrees of a sign, treat its sign as uncertain. If it sits in the middle, the degree is off and the sign is not.
Juno comes with the rest of the chart, marked as approximate, and the calculation is free.
See my JunoHow Juno moves
Juno is fast for an asteroid. It closes a lap in 1593.7 days — 4.36 years — against Chiron's fifty and Pluto's two hundred and forty-eight. Over a hundred years it changes sign 356 times, once every 102.6 days on average.
The orbit is markedly eccentric: 0.2565 of eccentricity, against Earth's 0.0167. That makes the speed vary a lot — from 0.595 degrees a day when it is fastest to 0.261 degrees a day backwards when it is retrograde. It is retrograde 21.2% of the time, which is the mark of every body beyond Earth: retrogradation is the Earth overtaking.
The inclination is high for the solar system too: 12.99 degrees out of the plane of the ecliptic, against less than two degrees for most planets.
Why there are no twelve Juno pages here
Because its sign comes out wrong in 3.6% of charts. Writing twelve pages of “Juno in X means Y” would be building interpretation on top of a number this site knows is off — and knows by how much.
It is the same decision the blog made about the stellium by sign, and for the same reason: when the measurement says the piece does not separate people the way the series assumes, the series does not get written. If Juno's ephemeris table ever gets built, the conversation changes.
What Juno does not say about you
It does not describe your marriage, and it does not predict partnership. The association with commitment is symbolic and recent, and there is nothing in the orbit of a 234-kilometre asteroid that speaks of human contracts.
And it is not one of the four pillars of a chart. Juno is a secondary piece, read after the Sun, the Moon, the Ascendant and the planets. A chart read without Juno is still whole; a chart read only through Juno is not a chart.
A limit said out loud, because it is part of reading seriously: none of this is prediction. Astrology describes tendency and gives vocabulary for what a person already lives — it does not determine what will happen, and nobody should be selling that.
Frequently asked questions about Juno
Can I trust my Juno's sign?
Most of the time, yes — and in 3.6% of charts, no. If it shows up in the first or last degrees of a sign, treat it as uncertain: that is exactly where a deviation of 1.48 degrees swaps the answer.
Why does another site show my Juno at a different degree?
Because it almost certainly uses a tabulated ephemeris, and this site uses a fixed ellipse. The measured average difference is 1.48 degrees, with a worst case of 8.62°. If you need the exact degree, the other number is the better one.
If it is off, why does the site show Juno?
Because being off by 1.48 degrees on average is still useful for reading sign and house in most charts, and because the answer says it is approximate. What would be dishonest is showing the number without the caveat.
How long does Juno stay in each sign?
On average 102.6 days, but it varies a lot: the orbit is eccentric, and the speed runs from 0.595 degrees a day to 0.261 backwards when it is retrograde.
Does Juno retrograde mean anything?
It is retrograde 21.2% of the time, which is the mark of any body beyond Earth — retrogradation is the Earth overtaking, not the asteroid changing course. A frequency that high describes little about anybody in particular.
Is Juno a planet?
No. It is a main-belt asteroid, 234 kilometres across, with a semi-major axis of 2.670 astronomical units. It was called a planet for a few decades after 1804, and lost the title when thousands like it turned up.
Juno in brief
Keywords Juno, asteroid Juno, Juno in astrology, ephemeris accuracy
This site’s Juno is off by 1.48 degrees on average, and its sign comes out wrong in 3.6% of charts. The answer says so alongside the point, because showing the number without the caveat is what would be dishonest. See your chart free here.
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