Is the ninth day of February this year a mourning day? Thank you for your suggestions!

The method of determining the "mourning day" is as follows:

Zhenggeng is associated with Qi Jia, Er Xin and Ba Qi,

The molecular formula of pentabutyl undecyl and tetrapropyl decanonyl,

On March 9, every May Day, Liu La was deeply mourned.

Call it a day of mourning.

"Mourning Day" is

Geng Day, Xin Day, E Day, C Day, Noon Day, Moonless Day, A Day, Youyue Day, Yue Day, Hai Day, Zi Yue Deck Day and Ugly Month Day.

Not if you press this button.

for reference only