Changes are shown in boldface type.
Seventeen articles (the) are missing from the original paragraph.
1 \S > The s\undial is probably \+the\ most ancient of scientific instruments. 2 This instrument tells time by measuring \+the\ passage of \+the\ sun through \+the\ sky. 3 Ancient men measured time by placing a stick in \+the\ ground and by watching \+the\ movement of its shadow. 4 \+The\ Egyptians and \+the\ Greeks constructed \+the\ first sundials, which divided each day into equal intervals called hours. 5 By A.D. 150, Greek mathematicians used trigonometry to plot hour lines. 6 Sundials were used from \+the\ sixteenth to \+the\ nineteenth centuries as \+the\ primary way of telling time. 7 Because sundial time (or solar time) is not \+the\ same as clock time, \+the\ development of mechanical clock and \+the\ adoption of standard time in nineteenth century caused \+the\ sundial to lose its practical value. 8 Nonetheless, sundials are sometimes still used today.
Notes:
From Improving the Grammar of Written English: The Editing Process, Beverly Benson and Patricia Byrd
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