Category: eclipses...

a complete or partial obscuring of a celestial body by another - i.e. when three celestial objects become aligned
an occultation, when a star, nebula, or planet disappears behind the moon - or a natural satellite or space probe vanishes behind a celestial body
a transit occurring when a relatively small body crosses the disk of a larger body - a sort of mini eclipse
the full moon entering the shadow of the Earth, first the umbra and then the penumbra - from first contact through partial phase, maximum phase, and eventually last contact
What is echo, what are light and shade, day and night, ocean and stars, earthquake and eclipse, there? The works of man are everywhere swallowed up in the immensity of nature. (HD Thoreau)
It is only during an eclipse that the Man in the Moon has a place in the sun. (anonymous)
An occultation of Venus is not half so difficult as an eclipse of the Sun, but because it comes seldom the world thinks it's a grand thing. (M. Twain)