Question 1580Navigation General70% to pass
The nadir is the point on the celestial sphere that is _______________.
AI Explanation
The correct answer is B) directly below the observer.
The nadir is the point on the celestial sphere that is directly opposite the zenith, which is the point directly overhead. Since the zenith is directly above the observer, the nadir must be the point directly below the observer, or "directly below the observer."
The other answer choices are incorrect because: A) Greenwich is a location on Earth, not a point on the celestial sphere; C) 90° away from the zenith is the horizon, not the nadir; and D) the western horizon is a location on Earth, not a point on the celestial sphere.
Related Questions
#1578 Which condition exists at the summer solstice in the Northern Hemisphere? #1579 The path that the Sun appears to take among the stars is the _______________.#1581 The difference in local time between an observer on 114°W and one on 119°W is _______________.#1582 When correcting apparent altitude to observed altitude, you do NOT apply a correction for _______________.#1583 The summer solstice is the point where the Sun is at _______________.