Linked from
The 22 pages that link to Solar eclipse, each with the reason it gives.
Camera obscuraRelated: A camera obscura projects a safe image of the Sun for observing an eclipse.
MoonRelated: The Moon’s apparent size and orbital alignment make solar eclipses possible.
Draconic monthRelated: A solar eclipse requires the new Moon to occur near a node.
New moonRelated: A solar eclipse can occur only near new moon, when alignment is close enough.
Stellar coronaRelated: Total eclipses historically exposed the corona against the bright solar disk.