Grain in Ear begins when the Sun reaches the celestial longitude of 75° and ends when it reaches the longitude of 90°.

Formula: [Y*D+C]-L

Note: Y refers to the last two numbers in a year, such as 10 in 2010, 08 in 2008; D=0.2422; L=the number of leap years; 21st century C=5.678; 20th century C=6.5

For example: The date of Grain in Ear in 2088=[88× 0.2422+5.678]-[88/4]=26-22=4, Grain in Ear falls on June 4.

Exceptions: 1902, add one to the calculated result