Ceres is a dwarf planet that corresponds to nurturing energy. It's attentive, caring, nourishing, and supportive. Ceres is there for you, no matter what, and will sacrifice everything in its devotion to you.
Ceres relates to motherly love, so it can be a strong connection in family relationships, and help provide a feeling of family with friendships. In romantic relationships, Ceres can help with loyalty and create a supportive connection.
A strong Ceres in your natal chart can show that supportive, loyal connections with others are important to you in all of your relationships. With Ceres ruling motherly love, it can also show a big impact by your mother (positive or negative).
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Ceres Transits & Love
You may find you're much more supportive and nurturing in love under Ceres aspects (conjunction, sextile, trine) to your natal 5th house ruler (house of love), 7th house ruler (house of commitment), and Venus (planet of love). With transit Ceres in the 5th house, you can be super affectionate and love to express love. With transit Ceres in the 7th house, you can be super loyal and helpful with your loved ones, and want more care in return.
With hard aspects (squares, oppositions) by transit Ceres to your 5th house ruler, 7th house ruler, or Venus, it may be more difficult to have healthy support. You may feel like you're not getting enough at all from others, cut off from them, or someone may be giving too much (in an almost stalker-like way). Or you may be the one who is giving anything and everything and needs to cut things off. It's easy for Ceres to go overboard, and that has to be managed. Finding the middle and negotiating some peace, even with just yourself, may be needed.
Ceres & Synastry
When you have a Ceres connection with someone in synastry, this can show a connection that has a lot of support between you. It can be loving, nurturing, and devoted. This can be a very pleasant connection with the Sun, Moon, Mercury, Venus, Mars, Jupiter, or Chiron, or one of the love asteroids.
This may be a more difficult connection with Saturn, Uranus, Neptune, or Pluto. With Saturn, that nurturing energy may be nonexistent, and it's difficult to support each other. With Uranus, it may be too erratic, with great support and then none at all and then back again, and it needs some stability. With Neptune, there may be an issue with boundaries, and it can be easy to get lost in the devotion. With Pluto, one may drain the other, and a power imbalance can occur.
Ceres can be great to see in family relationships, so long as one doesn't grow obsessed with the other (a little Mommy Dearest?). In friendships, it can show feeling like this person is like family, and your loyalty to one another may be more like a family loyalty. But with hard connections, it may show major struggles with family or friends.
Positive connections with Ceres can help offset the challenges, and help stabilize your connection. Without them, you'll need to look at strong Moon and Venus connections to make up for it.
Suggested Reading: Articles in the love astrology series: Mars, Jupiter, Saturn, Uranus, Neptune, Pluto, the 12th house, Chiron, eclipses, retrogrades, the Lunar Nodes, Black Moon Lilith, and the Asteroids of Your Name