Public domain
A Greenwich Observatory on Mars
From the collection of NASA Image and Video Library. Free to download, adapt and use — no permission needed.
About this work
The crater in the center of this HiRISE image defines where zero longitude is on Mars, like the Greenwich Observatory does for the Earth. Originally, the larger crater that this crater sits within, called Airy Crater, defined zero longitude for the Red Planet. But as higher resolution images became available, a smaller feature was needed. This crater, called Airy-0 (zero), was selected because it would require no adjustment of existing maps.
NASA Image and Video Library’s own descriptionCredit lineA Greenwich Observatory on Mars. NASA/JPL, 2022-01-21. Public domain. ID: PIA25090.
