1728 in science

• James Bradley uses stellar aberration (first observed in 1725) to calculate the speed of light to be approximately 301,000 km/s. • James Bradley observes nutation of the Earth's axis. ==Botany==

• September – Bartram's Garden, the oldest surviving botanic garden in North America, is established in Philadelphia by John Bartram. ==Exploration==

• July 14 – August 14 – Vitus Bering sails northward from the Kamchatka Peninsula, through the Bering Strait, and rounds Cape Dezhnev. ==Physiology and medicine==

• Pierre Fauchard publishes Le Chirurgien Dentiste, ou, Traité des Dents, the first comprehensive text on dentistry, including the first description of orthodontic braces. ==Births==

• February 13 – John Hunter, Scottish surgeon, pathologist and comparative anatomist (died 1793) • March 20 – Samuel-Auguste Tissot, Swiss physician (died 1797) • April 16 – Joseph Black, Scottish physicist and chemist (died 1799) • August 26 – Johann Heinrich Lambert, Swiss polymath (died 1777) • September 3 – Matthew Boulton, English mechanical engineer (died 1809) • October 27 – James Cook, English explorer (died 1779) ==Deaths==

• April 25 – John Woodward, English naturalist (born 1665) • August 11 – William Sherard, English botanist (born 1659) • Caleb Threlkeld, Irish botanist (born 1676) ==References==