Photo Descriptors - The Port Arthur, TX Equatorial Sundial

ROW 1
patx1.jpg - ~5:17 p.m. L.A.T. Gnomon shadow falls on upper dial face from
MAR Equinox to SEP Equinox. An equatorial sundial is actually a reduced
model of the Earth, similar to a globe with its upper and lower halves
removed: the dial plate represents the plane of the Earth's Equator; the
gnomon represents the Earth's axis of rotation.

patx2.jpg - Close-up of dial plate showing equivalent time for locations
in 16 different time zones.

ROW 2
patx3.jpg - Graph, Equation of Time (EoT) used to correct solar time for 
standard time. Sundial inscription: 'Erected 1973 by Explorer Posts 
700/701. Sponsored by the port of Port Arthur Port Commission.'

patx4.jpg - Close-up, Equation of Time (EoT) graph used to correct solar
time for standard time. Vertical/horizontal hatchmarks indicate day of
month/minutes of time. Note: The Equation of Time graphs also show the
Zodiac (upper x-axis), the band of constellations through which the Sun,
Moon, and planets move in the course of a year. Remember that signs of the
Zodiac are 'Sun signs,' meaning that they appear in the day sky on your
birthdate (the Sun is 'in' your sign).

ROW 3
patx5.jpg - Gnomon shadow falls on lower dial face from SEP Equinox to MAR 
Equinox.