Deimos would be an interesting place for observing an eclipse of the Sun
by Mars. A brilliant cerulean crescent heralds the emergence of
the Sun from behind the limb of Deimos' host. The crescent is created by sunlight
scattering through Mars' dust-laden atmosphere. While the Sun itself is not yet
visible, its corona of superheated gas extends several solar diameters
beyond Mars' horizon. This is the same solar corona that becomes visible briefly during a
total solar eclipse on Earth.
The Earth itself can be seen in this image as a pale blue dot
to the left of the crescent. To the lower right is the planet Mercury, and
down and right a little further is the planet Venus. While Venus orbits
closer to the Sun than the Earth, the relative
positions of the planets in their orbits make the Earth appear deceptively
closer to the Sun from this vantage point.