1721 in science

List of years in science (Table)
… 1711 • 1712 • 1713 • 1714 • 1715 • 1716 • 1717 • 1718 • 1719 • 1720 – 1721 – 1722 • 1723 • 1724 • 1725 • 1726 • 1727 • 1728 • 1729 • 1730 • 1731 …
Related time period or subjects
… 1718 • 1719 • 1720 – 1721 – 1722 • 1723 • 1724 … … 1690s • 1700s • 1710s – 1720s – 1730s • 1740s • 1750s … … 17th century – 18th century – 19th century …
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The year 1721 in science and technology involved some significant events.

Medicine

George Graham improves the pendulum clock's accuracy to 1 second per day by compensating for changes in the pendulum's length due to temperature variations.
In psychology, a suggestion box was developed with the eighth shogun of Japan, Yoshimune Tokugawa.