What is a natal chart?

A natal (birth) chart is a map of the sky for the exact date, time, and place of your birth. It shows where the Sun, Moon, planets, and key points sat across the twelve zodiac signs and houses, and the angles (aspects) between them — the basis of a western astrology reading.

What is western astrology?

Western (tropical) astrology interprets the positions of the planets relative to the seasons, using the tropical zodiac anchored to the equinoxes. Ocean Gull calculates these positions with the Swiss Ephemeris for professional accuracy.

Yes — Ocean Gull has a free plan that includes natal charts and core features. Paid plans add advanced points, higher transit quotas, and more.

What ephemeris does Ocean Gull use?

Ocean Gull uses the Swiss Ephemeris for chart and transit calculations, the same engine professional astrologers rely on for precision.

The Part of Necessity in Astrology: Meaning & Formula

What the Part of Necessity is

The Part of Necessity is the Hermetic lot of constraint and fate — the counterweight to Eros. Where Eros is what we desire and choose, Necessity is what is imposed: the obligations, compulsions and hard circumstances a person must accept rather than pursue. It is associated with Mercury and, in the ancient view, with the goddess Ananke, "necessity" itself.

It describes the places where freedom narrows and life must be met on its own unyielding terms.

How it is calculated

By day the Part of Necessity is Ascendant + Part of Fortune − Mercury; by night the formula reverses to Ascendant + Mercury − Part of Fortune. It requires the Part of Fortune first.

The Part of Necessity in the chart

The sign and house of the Part of Necessity indicate where a person encounters constraint, duty and the non-negotiable — the area of life shaped more by fate than by choice. It is read alongside the other Hermetic lots for a fuller picture of the balance between will and necessity in a life.