The sun has no shadow.
A shadow is the region that light from the source can't reach because there is some object
in the way. But the sun is the source of light in the solar system. No object can prevent the
sun's light from reaching the sun.
The sun
The shadow is caused by the light of the sun.
Actually the earth's shadow has both. This is caused by the sun, not the earth. The umbra is the dark shadow produced when the sunlight is totally blocked. The penumbra is the partially lit shadow produced because the sun is not a point light source.
You will see a partial eclipse if you are in the penumbra.
The "penumbra" or outer shadow is the area of a shadow from which part of the light source, but not all of it, is visible.For a total solar eclipse, the regions where the Moon's shadow only partially covers the Sun is called the penumbra. Areas where the maximum shadow occurs, where the Moon is centered on the Sun, is the umbra. An eclipse where the Moon does not cover the entire Sun is called an annular eclipse, and the shadow area is called the antumbra.
Within each shadow . . .The UMBRA is the region from which none of the sun is visible.The PENUMBRA is the region from which part of the sun, but not all, is visible.
The umbra is the darker total shadow; the penumbra is the surrounding partial shadow.
your shadow
I think you are asking what is the lighter part of the Earth's shadow on the Moon that surrounds the darkest part. The penumbra is this lighter part of the shadow. The darkest part is the umbra.
a partial shadow is a penumbra
Penumbra, the part outside the Umbra. In the Penumbra you see the sun with a bite taken out of it, but you still get daylight.
Umbra and penumbra when referred to the moon describes the shadow which is formed when light is blocked from the sun, by the moon. This shadow which falls on the Earth and has two distinct regions; a partially shadowed area which is the penumbra and the centre point a totally dark umbra. We on Earth looking skyward and watching the shadow pass as the Earth revolves would describe the penumbra as a partial eclipse and the umbra as a total eclipse.