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82°30′ E is the standard meridian of India.
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The 82°30′ E meridian determines Indian Standard Time (IST).
This standard meridian passes near Mirzapur in Uttar Pradesh (close to Prayagraj). The local time along this meridian is taken as the standard time for the whole of India, so that clocks across the country show the same time.
Because the earth rotates 1° in 4 minutes, IST is \(82.5 \times 4 = 330\) minutes, i.e. 5 hours 30 minutes, ahead of Greenwich Mean Time.
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· 23 Oct 2026
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