They aren't, latitudes are.
Latitudes are parallel to the equator. Longitudes converge like elastics on a soccer ball.
All lines of constant latitude are parallel to all others,but no two lines of constant longitude are parallel.
Latitude lines are parallel but not longitude lines.
Probably never. Longitudes are generally the imaginary lines joining the North and South poles of a spherical object such as the earth; and these define the East-West location of points. Longitudes cannot be parallel and so it is unlikely that two points can be said to be in a parallel longitude.
Parallel lines never meet. On the other hand, every pair of longitudes meets at the Earth's North and South Poles.
Yes No, lines of longitude are as parallel to each other as the earth is flat. All longitudes intersect at the north and south poles.
The map you are referring to is likely the Mollweide projection. It is an equal-area projection that represents latitudes as straight parallel lines and longitudes as elliptical arcs. This projection aims to minimize distortion in terms of area, but distorts shapes and distances.
There are 360 longitudes
Lines of latitude run parallel to the equator. Lines of longitude run vertically - passing through both poles.
Equator: The boundary between the northern and southern hemispheres, extending through all longitudes. All hemispheres.Prime Meridian: The boundary between eastern and western hemispheres, extending through all latitudes. All hemispheres.Tropic of Cancer: The parallel of 23.5 north latitude, extending through all longitudes. Northern, eastern, western hemispheres.Tropic of Capricorn: The parallel of 23.5 south latitude, extending through all longitudes. hemispheres. Southern, eastern western hemispheres.
In navigation, the direction of travel is determined by the angle made with the direction North (the bearing), measured in the clockwise direction. For this purpose it is assumed that longitudes are parallel on the sacle of the journeys.
Equator: The boundary between the northern and southern hemispheres, extending through all longitudes. All hemispheres.Prime Meridian: The boundary between eastern and western hemispheres, extending through all latitudes. All hemispheres.Tropic of Cancer: The parallel of 23.5 north latitude, extending through all longitudes. Northern, eastern, western hemispheres.Tropic of Capricorn: The parallel of 23.5 south latitude, extending through all longitudes. hemispheres. Southern, eastern western hemispheres.