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Ångström is a small lunar impact crater located on the border between Oceanus Procellarum to the west and Mare Imbrium to the east. To the south is a formation of mounts rising out of the maria named the Montes Harbinger. To the east are some wrinkle ridges named the Dorsum Bucher and Dorsum Argand. This crater is bowl-shaped, with a circular rim and inner walls that slope down to the small central floor. It has a higher albedo than the surrounding maria
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| A demi-culverin or saker was a 17th Century term for a cannon which fired a 9-pound solid shot (a culverin fired an 18-pound shot). It is first employed by the Flemings in the early 1600s. The tube was about slightly over 3 metres long, and fired a shot 11 cm in diameter and between 4 and 6 kilograms in mass. With a weight of 1640 kg (3600 lb), it had a range of almost 2 km, though its effective range was only about 80 metres. Firing this gun was exceedingly dangerous - many gunners lost their lives to recoiling barrels, and blowback from the touchhole also led to many fatalities. |
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