Sundials

thumb|right|SSW facing, vertical declining sundial on the Moot Hall in Aldeburgh, Suffolk, England. The gnomon is a rod that is very narrow, so it functions as the style. The Latin motto loosely translates as "I only count the sunny hours." [[File:Melbourne sundial at Flagstaff Gardens.JPG|thumb|right|A horizontal dial commissioned in 1862, the gnomon is the triangular blade. The style is its inclined edge.

thumb|right|The gnomon is the triangular blade in this sundial.

thumb|Afternoon analemma photo taken in 1998–99 in Murray Hill, New Jersey|Murray Hill, [[New Jersey, U.S., by Jack Fishburn. The Bell Laboratories building is in the foreground.]]

apparent solar time minus mean solar time

sundial

monumental complex in Rome's Campus Martius built under Augustus

Gnomonics (from the ancient Greek word γνώμων, , meaning 'interpreter, discerner') is the study of the design, construction and use of sundials.

right|thumb|Moondial at Queens' College, Cambridge, showing the table of corrections for the phase of the moon

glass cable-stayed bridge located in Redding, California

sundial equipped with a cannon which fires at noon

type of sundial

Synagogue in Jerusalem

showing more than just the time of day

statue in Trondeim

Wikimedia history article

early astronomical instrument

dune on Curonian Spit, Lithuania

monument in Haidian, Beijing

type of sundial

sculpture by Henry Moore (LH 528, Adler Planetarium & Astronomy Museum, Chicago)

sundial listing the canonical hours

Ancient Roman inscriptions guiding farming in each month

type of clock

right|thumb|An image of MarsDial thumb|MarsDial on Spirit rover|Spirit rover on Mars The MarsDial is a sundial that was devised for missions to Mars. It is used to calibrate the Pancam cameras of the Mars landers. MarsDials were placed on the Spirit and Opportunity Mars rovers, inscribed with the words "Two worlds, One sun" and the word "Mars" in 22 languages. The MarsDial can function as a gnomon, the stick or other vertical part of a sundial. The length and direction of the shadow cast by the stick allows observers to calculate the time of day. The sundial can also be used to tell which way