“The Martian Crater marks the spot”

You are looking at 0 degree longitude on Mars-the Greenwich Observatory equivalent on the Red Planet. The Greenwich Observatory marks Earth’s Prime Meridian, which is a north-south line that defines where east meets west, and is used as the zero-reference line for astronomical observations.

Mars satellite captures wild image of an ancient Martian crater
Mars satellite captures wild image of an ancient Martian crater

The larger crater that sits within this crater, called the Airy Crater, originally defined zero longitude for Mars, but as higher resolution photos became available, a smaller feature was needed. this crater, called Airy-0(zero) was selected because it did not need to adjust existing maps.

NASA satellite captures a dazzling, important crater on Mars
NASA satellite captures a dazzling, important crater on Mars

This image was captured by the High-Resolution Imaging Science Experiment (HiRISE), on the Mars Reconnaissance Orbiter. The map is projected here at a scale of 50 centimeters (19.7 inches) per pixel.

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