From a gate to a numbered line
A line identifies one of six parts of a Human Design gate. It is not a channel drawn between centers. Under the Atlas equal-angle convention, a gate covers 5.625 degrees and a line covers 0.9375 degrees. The displayed number locates the planet within that gate; changing the gate number does not by itself imply a different line number.
Work a boundary example
Consider an invented Personality Sun exactly at a gate’s start. It occupies line 1. At 0.8125 degrees into that gate, the Personality remains in line 1 while the Design Sun crosses its next line boundary: the profile changes from 1/3 to 1/4. At 0.9375 degrees, the Personality enters line 2 and the pair becomes 2/4.
This example follows from subtracting 88 degrees, reducing positions around the circle, and dividing by the line width. It does not require a birth chart or a personal interpretation. At a numerical boundary, inspect the unrounded longitude and the declared tolerance; a rounded display can conceal the side that supplied the number.
Keep the number and its theme distinct
The six traditional profile labels name broad roles in Human Design. A calculated line number does not prove that its associated role describes a person. Use the theme alongside lived examples, and leave room for disagreement.
Color, Tone and Base subdivide the position further. Their extra precision does not establish the psychological claims attached to them. In particular, Tone’s left/right orientation is not the same classification as a profile’s angle family.
Word origin · etymology
Latin through French; translated diagram term.
Line comes from linea, linen thread or line. Its system use inherits the six-line structure of an I Ching hexagram.
Merriam-Webster: line ↗Jovian Archive: The Mandala and the BodyGraph ↗
How we know · epistemology
Nested symbolic subdivision
The gate is divided into six equal angular parts, with each part assigned a line theme. This makes the number calculable; the theme's fit to a person is not established by the precision of the subdivision.
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Terms used in this explanation
These links connect subjects and terminology. They do not establish a shared historical origin.
Sources & provenance
Use the citations beside each section to distinguish a calculation convention, a historical teaching and an editorial example.