DC lines in astrocartography: Descendant lines
A DC line, also called a Descendant line or setting line, marks the places where a planet was setting on the western horizon at the moment you were born. Astrologers read it as the line of other people: near it, the planet shows up through partners, close friends, collaborators and rivals.
By Lucas Pradella · Updated 18 October 2026
What is a DC line in astrocartography?
A DC line, also called a Descendant line or setting line, marks every place where a planet was setting on the western horizon at the moment you were born. Astrologers read it as the line type of other people: partners, close friends, clients and rivals, the bonds through which that planet reaches you.
Every planet sinks below the western horizon once a day, the way the Sun does at dusk. At your birth, each planet was setting for one curve of places on Earth: that curve is its DC line. It is the mirror of the AC line. Near the equator a DC line lies 90 degrees of longitude east of the planet's MC line, on the opposite side of the world from its AC line.
Toward high latitudes the DC curve bends and finally meets the AC curve at latitude 90 minus the planet's declination, past which the planet did not set that day. On our map DC lines are dashed curves in the planet's color.
What astrologers associate with the DC line
The Descendant is the cusp of the seventh house, the house of the other: marriage and long partnerships, business partners, contracts, advisers, and open opponents. The DC point is where the self meets someone who is not the self.
A common idea in astrology is that a planet on the Descendant is met through other people before you own it yourself. On a Mars DC line you may run into strong-willed people; on a Jupiter DC line, generous ones. Tradition reads this as a mirror: the people a place brings you show you a side of the planet in your own chart.
The DC line, planet by planet
Each link opens the full page for that line.
| Line | Often described as |
|---|---|
| Sun DC line | Partners who mirror your purpose back to you; shared projects |
| Moon DC line | Emotional closeness; bonds that feel like family |
| Mercury DC line | Partners as conversation partners; debate and swapped ideas |
| Venus DC line | The classic romance line: affectionate, balanced relationships |
| Mars DC line | Passion and friction; assertive lovers and rivals |
| Jupiter DC line | Generous partners, teachers and allies from other backgrounds |
| Saturn DC line | Committed, grounding bonds; clear agreements and tested loyalty |
| Uranus DC line | Sudden attractions; relationships that need plenty of space |
| Neptune DC line | Romance with a veil; compassion, ideals and the risk of illusion |
| Pluto DC line | All-consuming bonds; questions of trust and control |
| North Node DC line | Meaningful meetings with partners and groups on your path |
| Chiron DC line | Teaching bonds that touch old wounds and ask for gentleness |
Love and relationships
The DC line is the one most people look at for love, and the Venus and Jupiter DC lines are the ones astrologers most often name as easy for relationships. Easy is not the only kind of good, though. A Saturn DC line is read as slow but serious, the kind of place where commitments are made and kept. A Neptune DC line can feel romantic and also invite idealizing someone. No line promises a partner; it describes the tone of the people you meet.
Work and home
At work, DC lines are read through one-to-one dealings: clients, agents, co-founders, negotiations and consulting. A Mercury DC line suits working in dialogue; a Mars DC line can bring competitors as well as energetic allies.
At home, a DC line colors who you share space with: housemates, a partner, neighbors you see every day, and how much of your life is lived with others rather than alone.
Strengths and challenges
Strengths
- A social line: meetings, introductions and allies.
- Useful for partnerships of every kind, not only romance.
- Teaches you about yourself through others.
Challenges
- You may hand the planet to other people instead of living it yourself.
- Harder planets here are read as friction with partners, rivals or clients.
- Relationships can take up more room than your own plans.
Visiting versus living near a DC line
On a trip, a DC line is often described in terms of the people you happen to meet. Living there is read as a lasting emphasis on your relationships. A line is still one input among many: work, visas, cost of living and the people already in your life count too, and no line is a reason to start or end a relationship.
How close you need to be
No distance is agreed; many astrologers give most weight to places within a few hundred kilometers. Click any place on the map to see the exact distance to each line. For two people, the couples view draws a second chart on the same map and shows the places you share.
Is the DC line the love line?
It is the line type astrologers most associate with partnership, and the Venus DC line is the classic one for romance. But AC, MC and IC lines also touch love in their own way, through how you come across, public relationships and settling down. See the best places for love.
Will I meet my partner on my DC line?
No line can promise that. Tradition describes the kind of people a DC line brings into your life, such as affectionate partners on a Venus DC line or serious ones on a Saturn DC line, not whether or when you meet someone. Many relationships begin far from any line, and the people involved matter far more than the place.
Is a Mars or Saturn DC line bad for relationships?
Not in itself. A Mars DC line is read as passionate and sometimes argumentative, a Saturn DC line as committed but serious. Both are described as places where relationships ask more of you, through honest conflict or clear commitment, which some people actively want. No line decides whether a relationship works.
What is the difference between an AC line and a DC line?
On an AC line the planet is read as part of you: your energy, image and first impressions. On a DC line it arrives through other people: partners, friends and rivals. They are the rising and setting lines of the same planet, about half a world apart near the equator and joined at high latitudes.