A hybrid eclipse is a rare type of solar eclipse, one which changes its appearance as the Moon′s shadow moves across the surface of the Earth. During a hybrid eclipse, the curvature of the Earth brings some sections of the eclipse path into the Moon′s umbra, the darkest part of the shadow, causing a total eclipse, while other areas, remain outside the umbra, but in the antumbra portion of the Moon′s shadow causing an annular eclipse.

A combination of an Annular and Total eclipse, the hybrid eclipse is an eclipse of the sun when the path of totality starts and ends in the antumbra of the moon′s shadow causing the eclipse to be seen as an annular eclipse. Then, once the shadow of the moon passes the transition line, the eclipse becomes a total eclipse.

Thus, the transition line is where the eclipse changes from an annular to total in the morning and then back to annular in the evening.