A total solar eclipse, or a complete blocking out of the Sun's light, can only be seen by those who live in the area covered by the umbra. People who live in the area of the Earth covered by the penumbra will see a partial eclipse.
Source: tatoeba (3961095)
[A]ny penumbral fringe that may be detected cannot be well distinguished from the effects of the true penumbræ; […]
Source: wiktionary
The other places see the penumbra of the moon's shadow fall on the earth, so the eclipse is partial, and part of the sun's disc is still visible.
Source: wiktionary
In the boiling temperature of 119 ° F – the hottest they had experienced so far – they watched as the penumbra of Venus blurred its outline at the precise moment the disc crossed the sun.
Source: wiktionary
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