The mystery of autumnal equinox

1, riddle: parting adds sorrow (making a solar term)

Answer: autumnal equinox

Analysis: the meaning of "parting" implies "parting"; Adding "autumn" to "heart" means "worry".

2. riddle: both hearts are concerned and angry (two bytes of gas)

Answer: autumnal equinox

Analysis: the combination of "autumnal equinox" and "two hearts" can become the word "grief and indignation"

3, riddle: cigarette butts (a solar term)

Answer: autumnal equinox

Analysis: the head of the word "smoke" is "river fire", just like the word "autumn" is split.