On a Lamberts chart a straight line track crosses a meridian with a direction of 043° T and a second meridian with a direction of 055° T. If the constant of the cone is 0.75 the difference in longitude between the meridians is:
A) 9°
B) 6°
C) 16°
D) 12°
ans is c
conv= dlong* constant of cone ...so how do we get the ans as c?
Constant of cone = 0.75
Convergence = 055 - 043 = 12 degrees.
As you said Convergence = dlong x constant of cone.
Rearranging this gives dlong = convergence / constant of cone
Inserting the data gives dlong = 12 degrees / 0.75 = 16 degrees.