Photo Descriptors - The Littleton, CO Equatorial Sundial

ROW 1
LITCO_118_1804.jpg - 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.

LITCO_117_1770.jpg - Upper dial face as viewed from the north (facing
south). The upper dial face represents the Northern Hemisphere; the lower
dial face represents the Southern Hemisphere.

ROW 2
LITCO_117_1789.jpg - The gnomon is the part of a sundial that casts the
shadow used to tell time. For equatorial sundials, the gnomon is a pole
(or rod) of varying thickness. The gnomon of a properly oriented
equatorial sundial points toward the Celestial North Pole. (The 'Pea Patch
Community Garden' appears in the background.)

LITCO_117_1792.jpg - The gnomon should be parallel to the Earth's axis,
inclined at an angle equal to the latitude of the observer. The dial plate
should be parallel to the plane of the Earth's Equator (perpendicular to
the gnomon), inclined at an angle equal to the complement of the
observer's latitude. This angle is also known as the colatitude. The
Littleton, CO sundial gnomon angle of inclination = ~39 degrees; dial
plate angle of inclination = ~51 degrees.

ROW 3
LITCO_118_1810.jpg - 

LITCO_118_1805.jpg - Take time to stop and smell the roses!

ROW 4
LITCO_117_1772.jpg - Gnomon shadow falls on upper dial face from MAR 
Equinox to SEP Equinox.

LITCO_117_1774.jpg - Saturday, 06 September 2003. ~6:10 p.m. MDT minus ~2 
min. EoT = ~6:08 MDT. Note the GPS receiver at the base of the dial plate.

ROW 5
LITCO_117_1786.jpg - Close-up, Garmin GPSmap 76S GPS receiver showing
exact location of sundial (+/- ~20 ft.).

LITCO_118_1812.jpg - 

ROW 6
LITCO_118_1807.jpg - The rose garden is north of the gazebo.

LITCO_118_1806.jpg - Note the 'War Memorial Rose Garden' sign in the
background.

ROW 7
LITCO_117_1780.jpg - View from the south (facing north).

LITCO_117_1783.jpg - Gnomon shadow falls on lower dial face from SEP 
Equinox to MAR Equinox.

ROW 8
LITCO_118_1802.jpg - Graph, Equation of Time (EoT) used to correct solar
time for standard time. Transcript of inscription: 'Read right edge of
shadow in A.M. Read left edge of shadow in P.M. The add or subtract number
of minutes shown on chart below for current date. The result will be
standard watch time in Littleton. For Daylight Savings [sic] Time subtract
one hour [sic]. Watches in Littleton are set at average time of Sun's
passage over the 105d meridian which lies along Datura Ave., just east of
here. The dial records solar time which is corrected to Standard Time by
this analemma. The dial parallels the Equator and the gnomon parallels the
Earth's north-south polar axis. Site of this dial is: longitude 105d0m10s;  
latitude 39d35m51s. 7 hours west of Greenwich, England.'

LITCO_118_1801.jpg - Graph, Equation of Time (EoT) used to correct solar
time for standard time. Graph, Equation of Time (EoT) used to correct
solar time for standard time. Transcript of inscription: 'Read left edge
of shadow in A.M. the right edge of shadow in P.M. Then add or subtract
number of minutes shown on chart below for current date. The result will
be standard watch time in Littleton. For Daylight Savings [sic] Time
subtract one hour [sic]. This chart is for fall-winter observation.'

ROW 9
LITCO_117_1800.jpg - Commemorative plaque, located in-ground on the
eastern side of the sundial. Commemorative plaque, located in-ground on
the eastern side of the sundial. Transcript of inscription: 'Littleton War
Memorial Park. Dedicated to the men and women who served in the armed
forces during all wars. 1968.'