Latitude and stuff.

How is the question stated word-for-word in your textbook?

"If the data was collected on the autumnal equinox, what is the observer's latitude?"

Equinox meridiator is a celestial meridiator that passes over equinoxes when intersect the equator and ecliptic. Equinox meridiator can be subdivided into two meridians: Spring Meridian (Midnight Meridian) and Autumn Meridian (Noon Meridian).

Spring Meridian/Midnight Meridian is a meridian that passes over the vernal equinox (0° celestial latitude) while passes over the equator. It passes through midnight virgin when intersects the equator. It has celestial longitude 0° or 0h.

Autumn Meridian/Noon Meridian is a meridian that when passes through the equator, it passes over the autumnal equinox (0° celestial latitude). This meridian passes through noon virgin when intersects the equator. It has celestial longitude 180° or 12h.