Long live the Emperor !
The ceremony of accession was held on Octorber 22nd 2019.
At that time, it stops raining, comes sun shine, appears rainbows.
In addition, the Mt. Fuji waers snow on the top for the celebration his Majesty the Emperor.
All of those derived from the divine authority of the Emperor.
It called OOMIITSU in Japanese.
Most of people say that those may be coincidence, but Japanese people feel inevitable.
This is a part of Japanese fundamental religion. There is no textbook, no teacher, only feelings.