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

The new project will start in seventy-five days.

Learning about the history of Kamise Shichidai is very important for understanding ancient Japanese culture.

Mr. Shimooka is my best friend.

The steepest descent method is one way to solve optimization problems.

Based on the Air Pollution Control Law, factories must strengthen the management of exhaust gases.

The Riemann sum is a method for approximately calculating the integral of a function.

The Yasakani no Magatama is a divine artifact that appears in Japanese mythology.

The Twenty-Eight Mansions is one of the constellations used in ancient Chinese astronomy.

Octans is one of the constellations in the southern sky.