Which part of the shadow would you need to be observe a total eclipse?

To observe a total eclipse, you need to be in the umbra, the darkest part of the shadow cast by the Moon. During a total solar eclipse, the umbra allows for the complete coverage of the Sun by the Moon, resulting in totality where the Sun is entirely obscured. Observers in the penumbra may see only a partial eclipse. Therefore, being in the umbra is essential for witnessing the full effect of a total eclipse.