Tomorrow will be the Summer Solstice.

明天就交夏至了。

The days get shorter after the Summer Solstice.

过了夏至， 天就开始变短。

The Summer Solstice, is the longest day in one year.

所谓夏至，ꓥ是一年中白天时间最长的一天。

Today is the longest day of the year. Summer Solstice.

今天是一年中白昼最长的日子——夏至。

The hottest days of summer begin after the summer solstice.

夏天最热的日子在夏至之后开始。