Sedna

Meaning

Sedna is a reddish body about a thousand kilometres across, on one of the most stretched orbits known: it comes no closer to the Sun than about 76 times the Earth’s distance, two and a half times as far as Neptune, and swings out to some 900 times that distance. One orbit takes roughly 11,400 years. It is now near its closest point, which it reaches around 2076, so it moves comparatively fast: it was in Taurus from the 1960s and has been in Gemini since 2024, where it will stay until the 2060s.

Its name is that of the Inuit goddess of the sea, who in one telling was thrown into the water by her father and became the mother and ruler of the sea’s creatures, living in the cold depths. Astrologers who use Sedna, still a small number, read it through its house and close aspects as abandonment, survival and slow recovery: what was thrown overboard, how a person endures, and the deep, unhurried rebuilding that follows.

Its sign is shared by everyone born over several decades, so on its own it says little; close to the Sun, the Moon or an angle, it can describe a long apprenticeship in solitude that ends in quiet strength.

In practice

• Close to a personal planet or an angle, Sedna may describe long stretches of feeling an outsider, or a hard break with family, followed by a life slowly built to stand on its own.
• Its house shows where those themes of distance and endurance are lived, read with the same caution as any new point.

Origin and history

Michael Brown, Chadwick Trujillo and David Rabinowitz found Sedna at Palomar Observatory on 14 November 2003 and announced it in 2004, naming it after the sea goddess because it is so cold and remote. Its orbit never brings it near Neptune, so astronomers still debate what shaped it: a passing star, an unseen planet, or the cluster in which the Sun was born. Astrologers began to use it soon after, and its meaning is still being explored. Traditional astrology, Indian and Chinese astrology and Human Design do not use it.

How Ulune calculates it

Ulune takes Sedna from the Swiss Ephemeris file made for it, which covers only the years 1500 to 2100: for a birth outside that span, the chart leaves Sedna out and says so. Within it, Sedna is marked retrograde when its daily motion runs backwards, which happens for nearly six months a year, and is aspected with the same orbs as the planets. Ulune gives it no dignity, leaves it out of aspect patterns, and the calendar does not date its transits.