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
Set against a wrinkle ridge, a frozen buckle in lava that cooled three billion years ago. The ridge points toward the crater like a drawn arrow.
Lacus Somniorum
In the Lake of Dreams, which carries the finest name on the near side and one of its softest, most diffuse borders.