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“It is faster to make a four-inch mirror then a six-inch mirror than to make a six-inch mirror." https://wiki.c2.com/?TelescopeRule https://wiki.c2.com/?Telesc
by ttoinou 1y ago
“It is faster to make a four-inch mirror then a six-inch mirror than to make a six-inch mirror."
https://wiki.c2.com/?TelescopeRule https://wiki.c2.com/?TelescopeRule