Tessera Human Design

Compares two people's charts: every channel the pair forms, grouped as electromagnetic (each brings one gate), companionship (both have it), dominance (one has it, the other neither gate) and compromise (one has it, the other one gate), with who holds what; the type, definition and defined centres of the combined chart; and each person's Type, Authority and Profile.

Explains one Human Design element in plain words: a type ("Projector"), an authority ("emotional authority"), a profile ("4/6"), a line ("line 3"), a definition ("split definition"), a centre ("Sacral"), a channel ("34-20"), a gate ("gate 51") or a basic topic ("what is Human Design", "open centres"). Gives the title and summary, the full text for types, authorities, profiles, definitions and basics, and the related centres, channels and gates.

Computes a person's Human Design chart from date, time and place of birth: Type with Strategy, Signature and Not-Self theme, Authority, Profile, Definition, Incarnation Cross angle and gates, defined and open centres, defined channels, and all 26 Personality and Design activations (planet, gate, line). Each element comes with its title and a one-line summary. When the birth time is unknown or approximate, it lists which parts of the chart could change within that window. Positions come from an ephemeris calculation (true lunar node, Design moment at 88 degrees of solar arc before birth), with historical time zones.

The gates and lines the Sun, Moon, nodes and planets activate at a moment (now by default, or a given date and time in UTC). With a person's birth data it also lists the channels the transits complete with that person's own gates, the usual way to read a day's influence, apart from channels the transits form on their own.