Chart term
Tropical zodiac
The zodiac Hali uses, measured from the spring equinox and tied to the seasons rather than the constellations.
What it is
The tropical zodiac divides the sky into twelve equal thirty degree signs, measured from the point where the Sun sits at the spring equinox. Zero degrees of Aries is defined as that equinox point, and the rest follow in order. It is tied to the seasons and the Sun’s path, not to the background stars.
Why Hali uses it
Hali uses the tropical zodiac, as nearly all Western astrology does. It was always a seasonal framework, a way of marking the Sun’s path through the year, rather than a claim about which constellation the Sun sits in front of. Because of a slow wobble in the Earth’s axis, the signs have drifted off the constellations they were named for, but that drift does not affect the tropical system, which is anchored to the equinox and moves with it.
The honest footnote
If you want the full story of why the sign Taurus no longer lines up with the constellation Taurus, see why your star sign is not a constellation, and to see your own signs in both zodiacs, try sidereal or tropical? Both systems are real. Hali is simply clear about which one it uses and why.
Questions
Is the tropical zodiac wrong because the signs no longer match the constellations?
No, it was never meant to match them. The tropical zodiac measures from the equinox, the turn of the seasons, not from the stars. It is a different, deliberate choice, and it is the one Western astrology has always used.
Sources: Hali chart engine. Standard astrology references.