I haven't read everything there is to read, but it seems Bernal had no confusion in 1958, either.
Daniel Asarnow
@dabiophysicist.bsky.social
1.6K followers 1.5K following 1.7K posts
Postdoctoral scholar in Veesler Lab @ UWa. Former UCSF & SFSU & UCSC student & Exploratorium Explainer. He/him. I take tiny pictures, in 2 & 3 dimensions. github.com/asarnow
![Wikipedia
https://en.wikipedia.org/wiki/Giant_Powder_Company
The public outcry that ensued from these two accidents prompted the Giant Powder Company to move across the bay to a more remote site that today straddles the city limits of Berkeley and Albany, between Fleming Point and Cerrito de San Antonio (later renamed "Albany Hill").[4] The railroad station for the facility was named "Nobel".[5] The Judson Manufacturing Co., whose founder and CEO Egbert Judson[6] had acquired an interest in Giant when it was still located in San Francisco, established its chemical works adjacent to the Giant plant to supply it with the acids for manufacturing dynamite.[7]
On April 15, 1880, another accidental explosion occurred killing many workers and several visitors.[8] The company then instituted more stringent safety measures, including the planting of eucalyptus trees atop the adjacent hill to act as a buffer for surrounding communities. During the 1880s, Giant decided to start manufacturing its own acids, creating a rift with partner Judson who then left the company and formed his own in 1890, the Judson Explosives and Powder Company. He constructed his own facility nearby, on the northwest side of the Cerrito de San Antonio.
On July 9, 1892, an explosion occurred on the Giant property which killed nine workers and caused damage to the nearby Judson site. The blast was widely felt, shattering windows for miles around,](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:lw3xw6b4qbkfbfw6as65kgbb/bafkreigb5jda4dkcji2urc47ts6xnc6qohryxqtfjkxwti36iyhvjfpi2i)
![Wikipedia:
Throughout the early to mid 1980s, a number of [US Federal] agencies worked to develop a solution to the SA "problem".[dubious – discuss] Since the SA signal was changed slowly, the effect of its offset on positioning was relatively fixed – that is, if the offset was "100 meters to the east", that offset would be true over a relatively wide area. This suggested that broadcasting this offset to local GPS receivers could eliminate the effects of SA, resulting in measurements closer to GPS's theoretical performance, around 15 metres (49 ft). Additionally, another major source of errors in a GPS fix is due to transmission delays in the ionosphere, which could also be measured and corrected for in the broadcast. This offered an improvement to about 5 metres (16 ft) accuracy, more than enough for most civilian needs.
The US Coast Guard was one of the more aggressive proponents of the DGPS, experimenting with the system on an ever-wider basis throughout the late 1980s and early 1990s. These signals are broadcast on marine longwave frequencies, which could be received on existing radiotelephones[further explanation needed] and fed into suitably equipped GPS receivers. Almost all major GPS vendors offered units with DGPS inputs, not only for the USCG signals, but also aviation units on either VHF or commercial AM radio bands.](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:lw3xw6b4qbkfbfw6as65kgbb/bafkreiafhfvt5hvrdtdpsu4edqwvsolbagkzyf22r6m5natkanjf3huetu)
![In 2022, Trump told the journalists Peter Baker and Susan Glasser: “I love maps. And I always said: ‘Look at the size of [Greenland]. It’s massive. That should be part of the United States.’”
https://www.politico.com/news/2025/05/10/trump-maps-obsession-history-geopolitics-00339935](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:lw3xw6b4qbkfbfw6as65kgbb/bafkreictjb37twwogmrc6j7fuzabfkuvmdzbkailvb4hmk6obi62mgxndq)
