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“Our ancestors, always hurried,” she writes in “Angel in the Forest,” “left little evidence of their existence, if one discounts intangibles, a sundial, an apple a day, an angel in the forest.”

Cross the orbit of 6446 Lomberg, the asteroid named in honor of his contributions to science, and sail by Mars, where the Spirit, Opportunity and Curiosity rovers bear sundials he helped design.

He kept track of time through a sundial during the day and stars at night, though he says he was given a watch near the end of his detention.

The largest of the group by far, “Point of Infinity,” is also a sundial in a sense, though without hour markings.

The ancient Egyptians invented the first water clocks and sundials more than 3,500 years ago.