That would be the Sun's Corona.
The Sun is bright, and the Earth is a rock about 8,000 miles across. So the Earth casts a shadow out into space. The Moon orbits the Earth, and about twice a year the Moon goes into the Earth's shadow. We call this a "lunar eclipse".
The dark shadow caused by the moon on Earth is called the umbra during a solar eclipse.
When we are in the Moon's shadow, it is called a solar eclipse. During a solar eclipse, the Moon passes between the Earth and the Sun, temporarily blocking the Sun's light and casting a shadow on the Earth. This phenomenon can be total, partial, or annular, depending on the alignment of the three celestial bodies.
The dark shadow cast by the Earth on the Moon during a lunar eclipse is called the umbra. This is the central and darkest part of the shadow where the light from the Sun is completely blocked.
lunar eclipse
You would call something that is obvious or visible "apparent" or "evident."
"Umbra" means "shadow". When the Moon enters the Earth's shadow, we call that a "total lunar eclipse".
Ah, what a lovely question! When the moon is not visible due to the Earth's shadow, we call it a lunar eclipse. It's a magical dance of light and shadows in the sky, creating a beautiful moment to appreciate the wonders of our universe. Just imagine the peaceful beauty of the moon slowly being covered and then revealed again by the Earth's shadow.
It is a syzygy.
A partial or total obscuring of the moon by the earth's shadow. Are you asking "If we are on the moon, what would a lunar eclipse be?" In that case, it would be something like what we call a solar eclipse, but it would be the earth obscuring the sun. I think it might more properly be called an occultation; the earth doesn't perfectly block the sun, it literally blots it out (in the case of a total lunar eclipse) for a while until it emerges from the other edge or limb of the earth.
Oh, the sun during a solar eclipse is just a magical sight, isn't it? You see, the moon moves between the Earth and the sun, creating what we call an eclipse. This blocks out the majority of sunlight, leaving just a narrow ring or a "diamond ring" effect - only a tiny, dazzling bit of the sun's brilliance peeking through. It's a breathtaking moment to witness the beauty of our universe at work.
A lunar eclipse.