noun
apparent noon; true noon
Astronomical term for the moment when the sun crosses the observer's meridian. Contrasts with 真正午 (mean noon).
See also: 真正午
視正午は、太陽が真南に来る時刻です。
Apparent noon is the time when the sun reaches true south.
視正午と真正午の差は均時差と呼ばれます。
The difference between apparent noon and mean noon is called the equation of time.
Compound of 視 (apparent, visual) and 正午 (noon). The term is used in astronomy to distinguish apparent solar time from mean solar time.