Sundials and a puzzle: fill 3x3 grid to sum twelve
The text describes ancient sundials from Sumerians and a puzzle using numbers 1 through 7. Place one number in each square of a 3x3 grid so every row of three squares totals twelve. No number repeats.
The First Clocks and Timekeeping Through History
The word clock derives from Latin clocca meaning bell and early clocks had a single hand called horologium. Atomic clocks, the most precise, rely on atomic vibrations and rarely lose or gain a second in 250000 years. An hourglass uses two glass bubbles and sand, taking one hour to flow between them, and marked a weather-independent time measure.
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Clocca
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