Trimorion. An aspect in Mundo which embraces three Houses, hence a Mundane square, but
which in some instances may actually extend to as much as 120°; hence in Primary Directions
it was sometimes called the killing arc, since 120 years were deemed the natural limit of life.
Trine, n. An aspect of 120°.
Trine, vb. Used in describing the motion of a planet to a trine aspect with the body or place
of another planet.
Trinities. v. Signs.
Triplicities. v. Signs.
Tropical Signs. Cancer and Capricorn. v. Signs.
Tropical Year. The Solar Year; the period of 365d, 5h, 48m, 4.5s, during which the Sun's
centre passes from one Vernal Equinox to the next. Because of the precession, it is shorter
than the Sidereal Year by 20m, 23.5s.
True Solar Day. v. Day.
Trutine. A term employed by Hermes in the process of rectification (q.v.).
Twilight. The illumination of the Earth's atmosphere after sunset, visible until the Sun is
about 18° below the horizon. Its duration depends upon the time required for the Sun to
traverse this distance. At the Equator this requires about an hour at any time of year, but
during Summer lasts for a much longer period. As one passes beyond 40° N. latitude, the
interval is lengthened in the Summer and shortened in the Winter.