APOD: 2020 August 24 Á Crescent Moon HDR
How come the crescent Moon doesn't look like this?
For one reason, because your eyes can't simultaneously
discern bright and dark regions like this.
or the da Vinci glow, the unlit part of a
is visible but usually hard to see because it is much dimmer than the sunlit arc.
In our digital age, however, the differences in brightness can be artificially reduced.
image is actually a digital composite of 15 short exposures of the bright crescent,
and 14 longer exposures of the dim remainder.
The origin of the
da Vinci glow
, as explained by
Leonardo da Vinci
about 510 years ago, is sunlight reflected first by the
Earth to the Moon, and then back
Moon to the Earth.
Authors & editors:
NASA Web Site Statements, Warnings,
NASA Official: Jay Norris.
A service of:
& Michigan Tech. U.
Publications with keywords: Moon
Publications with words: Moon