I called wanning.
It's usually said that the moon is 'waxing' when it appears to grow in size.
You can see the moon when it is not full. The sun lights up part of the moon, but if you look carefully when the moon is not full, you can see the darker parts. This is easier when only a small part of the moon appears to be lit, as a brighter moon glares out the darker part making it harder to see.
After the half-moon phase, the moon's lighted side appears to grow smaller every night, transitioning towards the new moon phase where the moon is not visible in the sky. This progression is known as the waning crescent phase.
It's usually said that the moon is 'waxing' when it appears to grow in size.
The little moon on Facebook signifies that you have activated the "Dark Mode" feature, which changes the background of the app to a darker color scheme. It is an option for users who prefer a darker interface for reduced eye strain or aesthetic purposes.
This phase is known as the waxing crescent phase of the Moon. During this phase, the Moon appears to grow thicker each night as more of its lighted side becomes visible from Earth.
The sky itself does not actually change, but the human eye adjusts to the higher light level with a contraction of the pupil, which makes the sky look darker, when the moon appears.
waxing
It means going from new moon to full moon.
When the moon appears completely dark it is called a new moon.
When the moon appears to be decreasing in size, it is called waning. When the moon appears to be increasing in size, it is called waxing.
This happens during a lunar eclipse when the earth appears apparently blocking out the moon. This can only happen on a full moon and due to this effect, the moon appears to be red.