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On This Day

  • 6-26-1274

    Astronomer and mathematician Nasir al-Din al-Tusi died in Baghdad. Born in Tus in what is now Iran, he spent most of his life there before joining invading Mongols on their westward campaign toward Baghdad in 1256.

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    Nasir al-Din al-Tusi
  • 6-26-1824

    Scottish physicist William Thomson, Lord Kelvin, born in Belfast, Ireland, where his father James was an engineering professor. When William was 8, the family moved to Glasgow, Scotland, and two years later, at age 10, William entered the University of Glasgow.

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    William Thomson (a.k.a. Lord Kelvin)
  • 6-26-1884

    Prime meridian established. The Greenwich meridian was adopted as the prime meridian on which the world's time zones are based.

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    Prime Meridian