It's very interesting to learn about the history of the Shōkei era.

I am a believer in Orthodoxy.

Calculating the value of secant, one of the trigonometric functions, is difficult.

The calculation of versine is a part of trigonometry.

This 正數 is the same as what I learned in school.

Positive charge is a type of electric charge of matter.

A regular polyhedron is a polyhedron where all faces are the same shape.

The cathode of this battery is made of copper.

There are more than a billion quintillion stars in this galaxy.

These two variables are in a proportional relationship.