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Super cool article. My grandmother is from Spain and it’s fascinating to learn more about history from this time period. A cousin once took me to the military M

Super cool article. My grandmother is from Spain and it’s fascinating to learn more about history from this time period. A cousin once took me to the military Maritime museum in Madrid and there’s a lot to mull over regarding the scientific/technology priorities of like, 600 to 1000 years ago. Writing this on a sailboat right now, with gps and internet, crazy how quickly things change but also stay the same Edit: it’s also so fascinating how the unit was altered over time and re-enscribed/calibrated. Hardware updates! Reminds me of some posts recently about imaging ancient scrolls and reading the original but erased text/script

082349872349872 2y ago
> how quickly things change but also stay the same As it'd be foolish to rely on things like gps that may no longer be around when you want/need to launch, as far as I know ICBMs (and presumably also SLBMs?) still shoot the stars near apogee, to fix their reckoning.
- mistrial9 2y ago
  Agree that non-electronic, non-networked navigation has a place but marine conditions often obscure the skies in this area of the world.. also the on-demand precision of modern times gets to be "required" for various interactions with other humans and their territory.
- adolph 2y ago
  For more information: The astro-nav's gimbaled telescope-like system on top of the guidance group works by making an ever-widening circular search pattern to find and fix three of any of 64 mapped stars in its memory, and compares their locations to a Julian calendar and a highly accurate chronometer. https://www.twz.com/17207/sr-71s-r2-d2-could-be-the-key-to-winning-future-fights-in-gps-denied-environments https://www.twz.com/17207/sr-71s-r2-d2-could-be-the-key-to-w... https://timeandnavigation.si.edu/multimedia-asset/nortronics-nas-14v2-astroinertial-navigation-system https://timeandnavigation.si.edu/multimedia-asset/nortronics...

082349872349872 2y ago

> how quickly things change but also stay the same As it'd be foolish to rely on things like gps that may no longer be around when you want/need to launch, as far as I know ICBMs (and presumably also SLBMs?) still shoot the stars near apogee, to fix their reckoning.

mistrial9 2y ago
Agree that non-electronic, non-networked navigation has a place but marine conditions often obscure the skies in this area of the world.. also the on-demand precision of modern times gets to be "required" for various interactions with other humans and their territory.
adolph 2y ago
For more information: The astro-nav's gimbaled telescope-like system on top of the guidance group works by making an ever-widening circular search pattern to find and fix three of any of 64 mapped stars in its memory, and compares their locations to a Julian calendar and a highly accurate chronometer. https://www.twz.com/17207/sr-71s-r2-d2-could-be-the-key-to-winning-future-fights-in-gps-denied-environments https://www.twz.com/17207/sr-71s-r2-d2-could-be-the-key-to-w... https://timeandnavigation.si.edu/multimedia-asset/nortronics-nas-14v2-astroinertial-navigation-system https://timeandnavigation.si.edu/multimedia-asset/nortronics...