3 ms·
I really appreciate the straight forward explanations. It does a good job at putting things into scale/perspective. However, I'm not convinced that discrepancie
by daveslash 5y ago
I really appreciate the straight forward explanations. It does a good job at putting things into scale/perspective. However, I'm not convinced that discrepancies this small are always "close enough". Consider the Patriot Missile Failure [1] (which has been discussed plenty here on HN [2]). The system's clock was off by about 0.000000095 decimal, but that was enough to result in catastrophic failure. I'm sure that this NASA post is intended for the layperson (which is good), but I'd hope that engineers have a bit more "involved" way of determining the appropriate number of decimals for any given applicaiton?
[1] https://www-users.cse.umn.edu/~arnold/disasters/patriot.html https://www-users.cse.umn.edu/~arnold/disasters/patriot.html
[2]https://hn.algolia.com/?dateRange=all&page=0&prefix=false&query=patriot%20missile&sort=byDate&type=story https://hn.algolia.com/?dateRange=all&page=0&prefix=false&qu...
- boxed 5y agoThe article doesn't mention it but adding precision doesn't help for another reason: space isn't flat. If you calculate the surface area of the earth or sun or whatever with pi you're off. Doesn't matter how many decimals you use. You're off because gravity distorts space.