JTC-1519
Mare Serenitatis
On the pale inner floor of the Sea of Serenity, a lava plain so flat that altimeters struggle to find a metre of relief for miles.
- Coordinates
- 27.90° N, 18.40° E
- Diameter
- 4.7 km
Schematic elevation, rendered from catalogue data. Sunlight from the west.
Mare Serenitatis
24.10° N, 12.60° E
Where the Sea of Serenity meets the highlands, on ground that has been struck, flooded by lava, and struck again.
Sits close to the monthly terminator line twice a month, which is when its shadow is longest.
Large craters that catch the sunrise line and throw kilometres of shadow.
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The Moon keeps one face turned toward Earth, so your crater is fixed in the same spot of sky every clear night of your life.
JTC-1583 lies at 24.10° N, 12.60° E, in Mare Serenitatis. On the map, north is up and east is to the right, exactly as it appears through a telescope from the high desert.

Mare Serenitatis
On the pale inner floor of the Sea of Serenity, a lava plain so flat that altimeters struggle to find a metre of relief for miles.
Mare Imbrium
Below the dark, perfectly flooded floor of Plato, on the northern shore of the Sea of Showers beneath the Alpine Valley.
Mare Nubium
In the Sea of Clouds, near the Straight Wall, a hundred-kilometre fault scarp that casts the sharpest straight shadow on the Moon.