Garmaine Staff asked 3 years ago

This answer to Visible sky features from Mars got me thinking.

On Earth it takes a while for the sky to get dark after sunset, which makes looking for Mercury a challenge because it follows the Sun fairly closely.

As seen from Mars, Mercury will have an even smaller separation from the Sun, but with its much thinner and cleaner and dryer atmosphere I have a hunch it might be easier to spot Mercury after sunset because the sky will darken (sufficiently to easily spot Mercury) much more quickly than it does on Earth.

Question: How quickly does night come on Mars compared to Earth? One can compare equatorial locations at the equinoxes to avoid lengthy discussions of geometry.

I've asked here rather than in Astronomy SE because there is likely to be spacecraft data on this from various Mars landers and rovers.

types of twilight on Earth

types of twilight on Earth