银河
发表于 2025-3-21 18:43:57
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glacial
发表于 2025-3-21 23:51:26
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Itinerant
发表于 2025-3-22 02:04:16
6: New Astronomy in the Old West,SNO expedition had home-town competition. Simon Newcomb tells us it was from “a rather dilapidated old dwelling-house, about half a mile or less from the Observatory, in one of those doubtful regions on the borderline between a slum and the lower order of respectability.”
caldron
发表于 2025-3-22 06:06:01
7: Observing in Style,in search of a northwest passage. It ended in entrapment within Arctic ice, starvation, and cannibalism. The Burton Speke expedition, to locate the source of the River Nile (from 1857 to 1859), faced desertion, illness, wild-animal attack, hostile locals, and mind-numbing duration. (Neither example
negligence
发表于 2025-3-22 11:17:55
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跑过
发表于 2025-3-22 15:25:21
11: The Canadians: Toques on the Frontier,lipse of 1870 would soon come their way. Nevertheless, there was one expedition from another country to the fringes of the United States that summer. It was mounted from Canada, a country only confederated two years before.
我不怕牺牲
发表于 2025-3-22 19:30:38
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净礼
发表于 2025-3-22 21:50:55
14: Standing on the Edge Looking Up,tact times at sites near the centerline, these intervals are of less value than those extremely near the limits of the total-eclipse path. If he had spread out those under his direction along the edge of totality, he could have mapped with great resolution the umbra’s width as a function of time. Mo
CAJ
发表于 2025-3-23 03:08:02
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deforestation
发表于 2025-3-23 05:59:27
19: What Did It All Mean?,69 total eclipse. The United States Naval Observatory, for instance, was staffed by only one thirty-year veteran astronomer in August of 1869. Professor Mordecai Yarnell (1816–1879; USNO) had to stay behind to tend the clocks and coordinate the longitude-establishing telegraph signals! It is true: A