In 499 CE, Aryabhata wrote down 24 numbers — 225, 224, 222, 219, 215, 210, 205, 199, 191, 183, 174, 164, 154, 143, 131, 119, 106, 93, 79, 65, 51, 37, 22, 7 — the world's first sine table. Hipparchus's chord table (~150 BCE) computed similar geometry but in chord lengths; Aryabhata's is the first table of half-chords (jya), which is what modern trigonometry calls sine.