It determines the amount of a planet or moon's visible surface that lies in shadow.

At the desk leg, there was another small portion of shiny narrow surface visible.

For these lands were the youngest part of the earth's vast visible surface.

But this time his feet did not stick to the visible surface; they sank into it.

Passenger ships should also carry the marking on a horizontal surface visible from the air.

Both are installed on visible surfaces of the window frame and sashes.

Pristine clouds boiled across nearly half of the visible surface, generated by the relentless heat.

The visible outer surface of the Sun is called the photosphere.

Region 419 was moving from the eastern half of the Sun's visible surface to the western, and this made it triply threatening.

"The only thing that should be left for the day of the party is a little 'fluffing' over visible surfaces."