Juno, the asteroid of commitment
Juno was the third asteroid ever found, in 1804, and is named for the queen of the Roman gods: the wife of Jupiter, the protector of marriage and of women, loyal through a famously difficult marriage. In the birth chart, astrologers read Juno as the part of you that seeks a lasting bond. Its sign describes the kind of partner and partnership that satisfies you. Its house shows where in life commitment plays out, and its aspects show which parts of you are wrapped up in it.
Juno moves slowly. It goes around the zodiac in about 4.4 years, so it spends about four months in each sign on average, and it changes sign only three or four times a year. Everyone born within a few months shares a Juno sign; the house, which needs a birth time, is what makes it personal.
Juno, Venus and the 7th house
Astrologers read three parts of the chart together for relationships:
- Venus is what you love and find attractive: how you flirt, give and enjoy. The Venus sign calculator gives yours.
- The 7th house and the Descendant describe the partners you draw and what you meet in others. The 12 houses explain each one.
- Juno is commitment itself: the partnership that keeps you once the attraction settles, and what you need to stay.
A Venus in fiery Aries with a Juno in steady Taurus, for instance, is read as someone drawn to excitement who stays for loyalty and security.
Juno between two charts
When two people compare charts in synastry, astrologers look at Juno closely. One partner's Sun, Moon, Venus or rising sign conjunct the other's Juno is read as a strong pull toward commitment, and a partner's Saturn on Juno as a bond built to last, with some weight to it. The composite chart blends two charts into one and is read for the relationship itself.
Reading your result
The contact list shows both positions and the orb: the distance from an exact aspect. Filter by planet or aspect to inspect a connection. Print and Copy for my AI include Juno's placement and every contact matching the current filters; the copied text leaves out your birth date, time and place.
Without a birth time, the calculator checks Juno's sign across the local day. A sign change shows both possibilities and their approximate local times. Degrees, motion and contacts remain noon references, and the Moon and angles are left out of the contact list. With a birth time, the result names the house system actually used; changing Chart settings can change the house without changing Juno's sign.
How it is worked out
Juno comes from a table of NASA JPL Horizons apparent positions viewed from Earth's center, sampled every five days and interpolated between samples. Usable coverage is January 6, 1900 through December 18, 2100 at midnight UTC. At 60 tested instants, the positions agree with the Swiss Ephemeris to within 4 arcseconds; that is a comparison sample, not a guarantee for every date. Unknown-time sign checks use half-hour steps. Crossings are estimated from the table and displayed to the nearest minute.
The house follows the house system chosen in Chart settings (Placidus by default, with Porphyry used where Placidus is unavailable). Aspects use 3° for the conjunction, opposition, square and trine, and 2° for the sextile. Juno's entry and exit times use the time-zone offset at each event, including daylight-saving changes. Your birth details stay in your browser.