Explain why some solar eclipses are total and some are annular. (Select all that apply.) The Moon's orbit around Earth is slightly elliptical.Annular eclipses occur only once a year.The Moon's orbit around Earth is completely circular.When the Moon is farther from Earth, the cone of its umbra does not quite reach Earth's surface, resulting in an annular eclipse.When the Moon is closer to Earth, we can experience a total solar eclipse.