Today's Rokuyo day

The Rokuyo meaning of those two kanji together is bad luck all day except at noon. Not a good day to do anything important, except perhaps memorial services and events suitable at midday. Registering your wedding at the city hall at midday sounds a good idea, though some offices might close at that time for lunch.

The name is derived from the eight demon gods under Akakuchigami, the guardian deity of the east gate of the royal capital of Tai Sui, .

Akakuchigami

Hence Shakku days cause trouble to people and creatures. The Rokuyo day originates from 'shakuzetsunichi' (赤舌日: red tongue day).

The colour red has a long wavelength and the second most visible colour in the colour spectrum. It therefore catches people's attention and a good choice to warn us of danger. God (or 'nature', if you prefer) knew this when deciding on what colour blood should be. (Yellow similarly has a long wavelength; a good choice for the colour of potential danger from fire.)

So the 'red' in Shakku can represent blood, and 'mouth' can represent speaking.

Together, these words caution tailors, carpenters, chefs, butchers, farmers, etc., who use knives and other sharp-edged implements.

Fire-eaters also should take care!

Also known as
Akakuchi, Shakko, Jakko and Sekiguchi