What does «ecuador» mean in Spanish?
- The maximum circle considered on the celestial sphere perpendicular to the Earth's axis.
- Parallel of the largest radius of a surface of revolution.
- Magnetic equator, line drawn on the Earth by all points where the inclination of the magnetic needle is zero.
- Terrestrial equator, maximum circle of the Earth perpendicular to the line of the poles. Also called equinoctial line.
- Equator crossing, moment when the equator is crossed; middle of a student's career.