shadow transit

Jupiter, Io, and Ganymede's shadow

Jupiter, Io, and Ganymede's shadow.

A shadow transit is the passage of the shadow of a moon, cast by the Sun, across the face a planet. The easiest to see are those of the Galilean satellites on Jupiter and of Titan on Saturn. Occasionally, shadow transits of several of the other larger moons of Saturn can be seen through very large telescopes. See also transit.