What are the factors that affect the regional solar terms sooner or later?

1. Location: Generally, the terrain is gentle, with early solar terms and high terrain; For example, the difference between the eastern and western solar terms in China;

2. Temperature conditions: Generally, solar terms in areas with small temperature difference change are earlier than those in areas with large temperature difference change; For example, the difference between the northern and southern solar terms in China;

Man-made: for example, deforestation, resulting in a harsh natural environment.