First, the Moon has to be full, so there is only an opportunity for a lunar eclipse about once each month. Second, the Moon has to pass through Earth's shadow. The Moon's orbit around Earth is tilted a little, or off kilter by about 5 degrees to the Earth's orbit around the Sun.
From Wikipedia, the free encyclopedia. The Seven Mile Bridge is a famous bridge in the Florida Keys, in Monroe County, Florida, United States. It connects Knight's Key (part of the city of Marathon, Florida) in the Middle Keys to Little Duck Key in the Lower Keys.
It is constructed of steel and concrete. Steel cables clad in 84 9-inch (229 mm) steel tubes (42 per pylon) along the center line of the bridge support the main span. It was designed by the Figg & Muller Engineering Group (who also designed the popular Seven Mile Bridge), and built by the American Bridge Company.