The Astronomical Observatories of Jai Singh c12.s1.24

c12.s1.24

⁸ This must be an equinoctial shadow length, which gives a latitude of tan⁻¹ 4 4/12 (or 4⅓) = 20° 57¼′ roughly. The correct latitude is about 23° 10′, which gives a shadow of 5⅝ digits.