Herbert Hoover reputedly wanted a car in every garage and a chicken in every pot. Woodruff Sullivan would settle for a sundial in every backyard. Sullivan, a University of Washington astronomy professor, is teaming up with television personality Bill Nye, “the science guy,” and The Planetary Society on EarthDial, a project to get schools, community organizations and individuals around the world to build their own sundials and display them on the Internet using 24-hour webcams.