本ほん初しょ

noun, adverb

beginning; origin; start

Formal or literary term for the very beginning or origin of something. Often used in fixed expressions like 本初子午線 (prime meridian).

• 本ほん初しょ子し午ご線せんは経けい度ど0度どの線せんです。

  The prime meridian is the line of 0 degrees longitude.

• この儀ぎ式しき