Equinox and Eruptive Prominence . ... Credit Copyright: SOHO - EIT Consortium, ESA , NASA Explanation: Today, the Sun crosses the celestial equator and seasons change from Summer to Fall in the north and Winter to Spring in the southern hemisphere. ... Just last week the active Sun produced the dramatic eruptive prominence seen in this extreme ultraviolet picture from the space-based SOHO observatory . ... How big is the prominence? Click on the image to view the larger full-sun picture. ...