Our star, the Sun, on occasion joins forces with the Moon to offer us Earthlings a spectacular solar eclipse – like the one that will be visible to parts of the United States, Mexico, and Canada on April 8. But out there, among the other stars, how often can we see similar eclipses? The answer depends on your point of view. Literally. On Earth, a total solar eclipse occurs when the Moon blocks the Sun’s disk as seen from part of Earth’s surface. In this case, the “path of totality” will be a strip cutting across the country, from Texas to Maine. We also can see “eclipses” involving Mercury and…