A connection
How did Money lead to Satellites?
7 steps · 7 domains · 4,957 years
- Money~3,000 BC (silver by weight) · 3,000 BCA token everyone accepts because everyone else accepts it — letting total strangers cooperate without knowing or trusting each other.
- それを考えうるものにした ↓Double-entry bookkeeping1494 (Pacioli's Summa) · 1494 ADA way of recording every transaction twice — once as a debit and once as an equal credit — so that the books must always balance, and any error or theft shows up as a gap that will not close.
The books measure every different thing — grain, ships, debts, cash — in one money-of-account, so unlike goods can be added and balanced against each other.
- これを必要としたのが—— それを考えうるものにした ↑Numbers and Geometry~3,400 BC (token accounting) · 3,400 BCWays of counting, calculating, and measuring shapes — the mental tools that turn "some sheep" into "seventeen sheep" and "that field" into "so many paces on each side."
Every entry is a signed quantity; the whole method is arithmetic disciplined so the two columns must sum to the same total.
- それを考えうるものにした ↓Navigation~1090 AD (magnetized needle described 1088; compass at sea by ~1119) · 1090 ADThe compass, the chart, and the stars — the toolkit that lets a ship leave sight of land and arrive somewhere on purpose.
- これを必要としたのが—— それを可能にした ↑Iron Smelting (Bloomery)~1,500 BC · 1,500 BCReducing iron ore to workable metal in a charcoal-fired clay furnace.
- それを可能にした ↓Steam Engine1712 AD (Newcomen) · 1712 ADA machine that burns fuel to boil water and turns the push of steam into continuous mechanical work — fire become motion.
- それを作れるものにした ↓Chemical Engineering1888 AD (first curriculum) · 1888 ADThe discipline of running chemical reactions continuously, safely, and at factory scale — built on the insight that every plant is the same dozen basic operations recombined.
- それを作れるものにした ↓Satellites1957 AD (Sputnik) · 1957 ADMachines thrown so fast around the Earth that they fall forever — relaying signals, photographing weather, and broadcasting the exact time to anyone below.
Every link in this chain is a verified dependency — not a trivia association. Explore either end: Money or Satellites.