I think angle measured from true meridian is called azimuth.

**Azimuth and Survey Lines**

- In surveying, azimuth refers to the horizontal angle measured clockwise from a reference direction, usually the true north or the true south, to a survey line.
- A survey line is a line formed by connecting two survey points or landmarks.

**Difference between Azimuth and Bearing**

- While azimuth measures the angle from the reference direction to the survey line, bearing measures the angle from the north or south direction to the survey line.
- In other words, azimuth takes into account the declination or variation of the magnetic north, while bearing does not.

**Declination and Azimuth**

- Declination refers to the angular difference between the true north and the magnetic north at a specific location.
- This declination can vary from one location to another and can change over time.
- When determining an azimuth, it is important to consider the declination and adjust the angle accordingly.
- The smaller horizontal angle between the true meridian (true north or true south) and a survey line is known as the azimuth.

**Importance of Azimuth in Surveying**

- Azimuth is a crucial component in surveying as it helps in determining the direction and orientation of survey lines.
- It allows surveyors to accurately establish the positions of points and lines on the ground.
- By measuring the azimuth of a survey line, surveyors can determine the angle at which the line deviates from the true north or true south.
- This information is essential for creating accurate survey maps, establishing boundaries, and performing various engineering and construction activities.

**Conclusion**

- The smaller horizontal angle between the true meridian and a survey line is known as the azimuth.
- Azimuth plays a vital role in surveying and helps determine the direction and orientation of survey lines.
- By considering the declination or variation of the magnetic north, surveyors can accurately establish the positions of points and lines on the ground.

Azimuth is the correct answer
Azimuth:Smaller angle between survey line and true meridian.
Azimuths are generally observed from the north. Azimuths may be geodetic, astronomic, magnetic, grid, record, or assumed, depending on the reference meridian used.