The Astronomical Observatories of Jai Singh c6.s1.t1.80
The Astronomical Observatories of Jai Singh c6.s1.t1.80
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c6.s1.t1.80
⁴ One second of longitude at Delhi is roughly equivalent to about 30 yards; very roughly a mile to a minute of arc. (At latitude 30° N. one degree of longitude=96489 metres=59.97 miles)