We have our wedding on the twenty-first day of the month.

I will hold my birthday party on the twenty-eighth day of the month.

We have our wedding on the twenty-third day of the month.

We celebrate our wedding anniversary on the twenty-fifth day of the month.

Learning about the history of the Kōkyū jūni-shi is very interesting.

He has a wealth of knowledge about the zodiac.

He is doing squats to train his biceps femoris muscle.

He made a model of a regular dodecahedron.

He made a model of a regular icosahedron.

He made a model of a dodecahedron.