Azimuth is defined as a horizontal angle measured clockwise from which reference line?

• A. East base line
• B. North base line
• C. South base line
• D. West base line

Answer: (B)

Azimuth is the horizontal angle measured clockwise from true north. This north reference line provides a fixed baseline so directions can be expressed consistently; 0° points to north, 90° to the east, 180° to the south, and 270° to the west. In practice, you take the direction to the object and measure the angle clockwise from that north line. If you used a different reference line, the numbers would shift accordingly.