Astronomic azimuth is based on which reference?

Astronomic azimuth is based on which reference?

• A. True north
• B. Magnetic north
• C. Geographic south
• D. Local north

Answer: (A)

Astronomic azimuth is measured from true north—the geographic direction toward the North Pole. This fixed reference comes from celestial observations and the geographic coordinate system, so the angle is the clockwise rotation from true north to the line being measured. Magnetic north would require a compass and varies with location and time, which is why it isn’t used for astronomical azimuth. Geographic south or local north aren’t the standard reference for this type of azimuth. In practice you’d align measurements to true north (often aided by identifying Polaris in the Northern Hemisphere) and then read the angle to the target line.

Astronomic azimuth is measured from true north—the geographic direction toward the North Pole. This fixed reference comes from celestial observations and the geographic coordinate system, so the angle is the clockwise rotation from true north to the line being measured. Magnetic north would require a compass and varies with location and time, which is why it isn’t used for astronomical azimuth. Geographic south or local north aren’t the standard reference for this type of azimuth. In practice you’d align measurements to true north (often aided by identifying Polaris in the Northern Hemisphere) and then read the angle to the target line.