The eclipse of the Sun happens when the Moon is positioned between the Sun and the Earth in a straight line.
Because....the Moon blocks the sunlight and its shadow falls on the surface of the Earth.
Click here to see more images of Eclipse of the Sun : http://www.google.com.my/search?q=eclipse+of+the+sun&hl=en&tbm=isch&source=lnms&ei=bSjeTuHcNInsrAfe3eyBCQ&sa=X&oi=mode_link&ct=mode&cd=2&ved=0CDAQ_AUoAQ&biw=1280&bih=659
Why it happens?
Because....the Moon blocks the sunlight and its shadow falls on the surface of the Earth.
Click here to see more images of Eclipse of the Sun : http://www.google.com.my/search?q=eclipse+of+the+sun&hl=en&tbm=isch&source=lnms&ei=bSjeTuHcNInsrAfe3eyBCQ&sa=X&oi=mode_link&ct=mode&cd=2&ved=0CDAQ_AUoAQ&biw=1280&bih=659
