What is the second of the 24 solar terms?

1 and the second one in 24 solar terms is rain.

2.24 The solar terms include: beginning of spring, rain, fright, vernal equinox, Qingming, Grain Rain, Changxia, Xiaoman, Miscanthus, Summer Solstice, Slight Summer, Great Summer, beginning of autumn, Early Summer, White Dew, Autumn Equinox, Cold Dew, Early Frost, beginning of winter, Light Snow, Heavy Snow, Winter Solstice, Slight Cold and Severe Cold.

3. Twenty-four solar terms are special festivals in the dry calendar that express seasons, phenology, climate change and establish "December construction" (seasonality). Initially, it was determined by the direction of rotation of the Big Dipper bucket handle. The Big Dipper rotates circularly, and bucket handle rotates around the east, south, west and north for one cycle, and each rotation cycle starts in beginning of spring and ends in the Great Cold.