Which astronomical calculation was significantly improved by Al-Battani's use of trigonometry in the late 9th century?

💡 Explanation

Al-Battani refined trigonometry, which enabled more accurate calculations solar and lunar positions in the sky, including during eclipses because he used sine, cosine, and tangent functions rather than geometric methods. Therefore, the timing and visibility of solar eclipses became more precise, rather than orbital radii, circumference, or luminosity which involve unrelated observations in different realms or eras.

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