Apparent Light. Navigational aid that appears to emit a light when it reflects or refracts a light more or less- remote. Erected in a position where a light would be difficult to maintain.
Apparent Midnight.Instant when true Sun transits the inferior meridian of a place.
Apparent Motion 19 Apse
Apparent Motion. Movement of a heavenly body as seen from Earth. Due to Earth's diurnal rotation, annual revolution, periodic nutation and precession, apparent motions bear little resemblance to the true movements. 2. The movement on a relative radar display of the echo of another ship. It is her motion relative to own ship. ('Relative Movement,' 'Relative Course and Speed').
Apparent Noon.Instant when true Sun is on the meridian at a place.
Apparent Right Ascension. Right ascension of a heavenly body as it appears to an observer when displaced by the aberration of light.