Noon is 12 o'clock (12:00) P.M., or when the Sun appears the highest in the sky, compared to its positions the rest of the day. It occurs when the Sun is transitting the celestial meridian. This is also the origin of the terms A.M. (ante meridian) and P.M. (post meridian).
... Both, however, regarded it as a peninsula, and were unaware of the existence of the Strait of Tartary, which was discovered in 1809 by a Japanese, Mamiya Rinzo[?]. The ...