A "total eclipse" refers to the complete blocking of one object, usually the Sun, by another object, usually the Moon, darkening the whole area for a short period of time. Full definition
The resulting photos have a few bright spots and lines, but most of the scene is in a murky, total eclipse of the sun, darkness. (morganlehmangallery.com)
This morning fifteen years later, my children ready for the school bus tell me an almost total eclipse is coming. (firstthings.com)