Lixia

Lìxià, "Rikka", "Ipha", or "Lập hạ" is the 7th solar term according to the traditional Chinese Calendar, which divides a year into 24 solar terms (節氣). It signifies the beginning of summer in Traditional Chinese cultures.
It begins when the Sun reaches the celestial longitude of 45° and ends when it reaches the longitude of 60°. It more often refers in particular to the day when the Sun is exactly at the celestial longitude of 45°. In the Gregorian calendar, it usually begins around May 5 and ends around May 21.