Question 1408Navigation General

The correct answer is D) 1.5 and greater. The term "first magnitude" is used to refer to celestial bodies with an apparent magnitude of 1.5 or brighter. This classification system was developed by ancient Greek astronomers and is still widely used today. Bodies of magnitude 1.5 and greater are considered the brightest objects in the night sky, and are known as "first magnitude" stars or celestial bodies. The other options are incorrect because they do not accurately reflect the standard definition of "first magnitude." Option A (1.25 and greater) is too lenient, while options B (1.0 and greater) and C (0.5 and greater) are too restrictive for the "first magnitude" classification.