Astronomical Events of 1990: A Stargazer's Almanac

Take a look back at the astronomical events of 1990, including sunspots, solar flares, Northern Lights, eclipses, meteor showers and comets, and the planetary year.

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Sunlight, reaching the moon from the upper left in this illustration, creates its phases: 1) new moon, 2) crescent, 3) first quarter, 4) gibbous, and 5) full. The moon then wanes through the sequence in reverse.  
FRED SCHAAF