the.com/astrolabe
the app store of the ancient sky, before there were either.
means a handheld instrument that models the heavens to tell time, latitude, and the hour of prayer.
from greek astron (star) plus lambanein (to take) — literally star-taker; refined by islamic astronomers in the 8th-10th centuries who added trigonometric scales and turned a greek curiosity into the smartphone of medieval science.
chaucer wrotea manual on it for his son, 1391
used fornavigation, astrology, and prayer times
peak eraislamic golden age, then medieval europe
basicallya rotating brass map of the stars