A sundial tells the time of day by the position of the sun's shadow.
A water clock measures elapsed time by the rate at which water drips into a receptacle.
sandclock ;sundial; waterclock
The only specialized word I can think of for the difference between two squares is "gnomon", and it's called that because it sort of looks like one (a gnomon is the word for the "pointer" part of a sundial).
I have a sundial in the garden.The sundial were the earliest form of clocks.
He used a portable sundial.
The answer depends on what is wrog with the sundial.
The pin of a sundial is called a gnomon. It is the part of the sundial that casts a shadow onto the dial face to indicate the time.
the ancient egyptians invented papyrus, an ancient form of paper. (the chinese made this other more modern form) the egyptians created glass. (theirs was colored, while the carthaginians managed to make it clear) they created the 365 day calender the pulley sundial waterclock they also mummified the dead, which helped us learn much about them
Theodosius of Bithynia invented the sundial.
The vertical pointer on a sundial is the gnomon.
The pointer on a sundial is called a gnomon. It casts a shadow on the sundial face to indicate the time.
the shadow of the sundial is just called a shadow
The raised arm of a sundial that indicates the time of day by its shadow is the gnomon (NO-mon). A sundial has but one arm, what do you mean by secondary arm?