Loxodrome is:

Question

Loxodrome is:

Accepted Answer

A loxodrome, also known as a rhumb line, is indeed a line of constant bearing (or constant compass direction) that crosses all meridians at the same angle. Therefore, Option 1, "a straight line joining two points on a projection giving a constant bearing," is the most accurate description, *especially when considering projections*. While a loxodrome appears as a curve on the globe itself, on certain map projections (specifically, the Mercator projection), it is represented as a straight line. This is a crucial aspect of its definition in the context of map projections.

Here's why the other options are incorrect:

*   **Option 2: a 180° longitude drawn on a Lambert's projection.** The 180° longitude is a specific meridian, and while it can be drawn on a Lambert's projection, it has nothing to do with the general definition of a loxodrome. A loxodrome can be any line of constant bearing, not just a specific meridian.

*   **Option 3: a graticule drawn parallel to equator.** A graticule drawn parallel to the equator is a line of latitude. While a line of latitude *can* be a loxodrome (specifically, the equator itself, or any line of latitude on a Mercator projection), the definition of a loxodrome is broader than just lines of latitude. It's any line of constant bearing.

*   **Option 4: a curved line joining two points on a projection giving a constant bearing.** While a loxodrome *appears* curved on the globe and on many projections, the key is that on a Mercator projection, it's a *straight* line. Option 1 is better because it acknowledges the straight-line representation on specific projections, which is a critical aspect of the loxodrome's utility in navigation. The constant bearing is the defining characteristic, and on a Mercator projection, that constant bearing is represented by a straight line.