Transit of Mercury from Mars

During a transit, Mercury can be seen from Mars as a small black disc moving across the face of the Sun.

Ephemeris data generated by JPL Horizons indicates that Opportunity would have been able to observe the transit from the start until local sunset at about 19:23 UTC, while Spirit could have observed it from local sunrise at about 19:38 UTC until the end of the transit.

The rover Curiosity observed the Mercury transit of June 3, 2014, marking the first time any planetary transit has been observed from a celestial body besides Earth.

[1] March 5, 2024: NASA released images of transits of the moon Deimos, the moon Phobos and the planet Mercury as viewed by the Perseverance rover on the planet Mars.

On January 16, 18551, transits of Mercury and Venus will occur 14 hours apart.