Which of these scientists, who had temperature scales named after them, was born the earliest?

Daniel Gabriel Fahrenheit was the earliest born of the three in 1686.

Daniel Gabriel Fahrenheit (24 May 1686 – 16 September 1736) was a physicist, inventor, and scientific instrument maker. A pioneer of exact thermometry, he helped lay the foundations for the era of precision thermometry by inventing the mercury-in-glass thermometer (first practical, accurate thermometer) and Fahrenheit scale (first standardized temperature scale to be widely used).

Anders Celsius (27 November 1701 – 25 April 1744) was a Swedish astronomer, physicist and mathematician. He was professor of astronomy at Uppsala University from 1730 to 1744, but traveled from 1732 to 1735 visiting notable observatories in Germany, Italy and France. He founded the Uppsala Astronomical Observatory in 1741, and in 1742 proposed the Celsius temperature scale which bears his name.

William Thomson, 1st Baron Kelvin (26 June 1824 – 17 December 1907) was a Scots-Irish mathematical physicist and engineer who was born in Belfast in 1824. Absolute temperatures are stated in units of kelvin in his honour.