the.com/libration
the moon plays peekaboo, wobbling just enough to show 59% of its face instead of 50%.
means a slow, real oscillation in the moon's orbit and orientation that lets earth-bound viewers see slightly more than half its surface over time.
from from latin librare, to balance, like a scale tipping back and forth — astronomers borrowed the word for the moon's slight tilting sway as it orbits.
extra surfacereveals 9% more moon than a static half
tidal lockingmoon still keeps rotation matched to orbit
three typeslatitude, longitude, and diurnal libration exist
lunar atlasearly cartographers relied on it to map edges