Why do we have a leap year every four years and true or false earth orbit around the sun is what causes night and day and what causes the link of shadows to change over the course of the day and true or false all constellations are visible from the earth each night and listens to observations that will lead you to believe that the earth rotates on exist and what kind of instrument developed by Leon Foucault, provides physical evidence that earth is rotating on its axis and fill in the blank using the word the same as a different van and other planets such as Mars and Jupiter have year lengths that are the length of a year on earth and if it is 9 AM in San Francisco, is it also 9 AM in New York? Why or why not?also A sundial uses patterns of what to tell time?A.) sunny days B.)shadows C.)clouds D.) stars