# Mathematical Digest

### Short Summaries of Articles about Mathematics

in the Popular Press

"Earth and Mars share a clock in the sky," by Sharon J. Huntington. *The Christian Science Moinitor*, 30December 2003.

The reporter explains that the Mars Exploration Rovers will be able to tell usthe time there by using the same system used for thousands of years here onEarth--the sundial. The article describes how Greek mathematician Eratosthenesused geometry to calculate the size of the Earth, and how sundials using thoseprinciples have been used to track time and distance over the centuries. Thearticle encourages readers to track the status of theMarsDials.

*--- Annette Emerson*