♓ Pisces — ecliptic 330° to 360°

There is no longitude 360° stored as a thirteenth place. When a calculation crosses that point, the degree becomes 0° and the sign label becomes Aries. A planet at 359.7° is Pisces. A planet at 0.2° is Aries. The March equinox longitude is that boundary. Dates on either side of about 20 March fall in different signs because the Sun’s longitude has wrapped.

Neptune is the ruler stored here. Jupiter is the traditional ruler in many texts and is calculated separately. Neptune moves slowly; its presence in the 330°–360° sky rows is a dated fact, not the definition of the sign. Mutable water trines Cancer and Scorpio at 120°, orb 8°. The opposition is Virgo at 180°. Gemini and Sagittarius are the squares at 90°. Taurus and Capricorn are the sextiles at 60°, orb 6°. Aquarius and Aries are the 30° neighbors. Aries is both the next sign and the wraparound of the coordinate system.

A Pisces sun sign ends the solar year in the tropical sequence and still does not include the Moon, the Ascendant, or Neptune’s sign. Those are other longitudes from the same ephemeris. The birth chart is the place to compute them together.