One sees the character "夂 zhǐ"
(to walk slowly) in both 冬天
dōng tiān and 夏天 xià
tiān.
One can imagine walking slowly on ice 冫bīng
(the "ice" radical) during winter 冬天 dōng tiān.
One can imagine walking
slowly by one 一 yī
self 自zì
enjoying summer 夏天
xià tiān.
It is also interesting to note that the character 夂
zhǐ
is in opposite positions in 冬dōng
and
夏
xià.
Also the Xia Dynasty 夏
朝 xià cháo is deemed the first Chinese
dynasty.