Assertion: magnetic field's line | /r/Synonym | agonic lines
Facets:
value: on a map of the earth
type: LOCATION
Source sentences:
text: Isogonic lines are lines on the Earth's surface along which the declination has the same constant value, and lines along which the declination is zero are called agonic lines.
text: On a map of the Earth, lines along which there is zero declination are called agonic lines.