Earth completes its shortest recorded day due to a slight acceleration in rotation, with July 9 lasting approximately 1.3 to 1.6 milliseconds less than 24 hours.

Earth's rotation or Earth's spin is the rotation of planet Earth around its own axis, as well as changes in the orientation of the rotation axis in space. Earth rotates eastward, in prograde motion. As viewed from the northern polar star Polaris, Earth turns counterclockwise.

July 9 is the 190th day of the year in the Gregorian calendar; 175 days remain until the end of the year.