The time it takes for the Earth to orbit the Sun is called a sidereal year.

Uton is my best friend.

Toshiyuki is my best friend.

I plan to take my annual leave next week.

He was working abroad for a year.

He was working abroad for one year.

It is said that we all become wiser as we age.

Eastern Wu was one of the three kingdoms during the Three Kingdoms period, existing from 229 to 280.

He started a business without a plan, forgetting the lesson of 'peach and chestnut seeds take three years to bear fruit, persimmons eight years.'

He succeeded in a difficult project with the spirit of 'ishi no ue ni mo sannen', which means great works are performed by perseverance.