The points at which the ecliptic and the celestial equator intersect are the vernal equinox and the autumnal point. The Sun crosses the celestial equator in a northerly direction at the vernal equinox, and in a southerly direction at the autumnal equinox.
Notes and References
- The image shows the relations between Earth's axial tilt (or obliquity), rotation axis and plane of orbit
- So called in the northern hemisphere, i.e. in Europe and North America