Question 1609Navigation General70% to pass
The phase correction should be applied to sights of Venus and Mars _______________.
AI Explanation
The correct answer is B) during twilight observations only.
The phase correction is applied to sights of Venus and Mars when they are observed during twilight, either in the morning or evening. This is because the illuminated portion of the planet's disk changes as it orbits the Sun, and this needs to be accounted for to obtain an accurate celestial observation.
The other options are incorrect because phase correction is not necessary at altitudes above 25° (option A), nor is it required during daytime observations (option D). Phase correction is specifically applied during twilight observations of Venus and Mars (option B).
Related Questions
#1607 The dividing meridian between zone descriptions -10 and -11 is _______________.#1608 The Sun's center may be coincident with both the celestial equator and the observer's prime vertical circle when _______________.#1610 Daylight savings time is a form of zone time that adopts the time _______________.#1611 A position obtained by taking lines of position from one object at different times and advancing them to a common time is a(n) _______________.#1612 The owner or Master of a towing vessel shall ensure that all tests and inspections of gear take place and are logged _______________.