 It has been read by or given to many of the characters within the series and is considered a source of information in regards to their abilities.A solar eclipse has been a recurring image in the series itself, and is also used as the series' logo (a of the "Baily's beads" phenomenon).A terrestrial eclipse (an eclipse in which the Earth covers the Sun, as viewed from an observation point away from the Earth) is used in the series' title sequence.