events
Comet Hale–Bopp is seen passing at perihelion.
Related Wikipedia articles
Comet Hale–Bopp
Great Comet of 1997
Comet Hale–Bopp is a long-period comet that was one of the most widely observed of the 20th century and one of the brightest seen for many decades.Source: Wikipedia (CC BY-SA)
Apsis
Either of two extreme points in a celestial object's orbit
An apsis is the farthest or nearest point in the orbit of a planetary body about its primary body. The line of apsides is the line connecting the two extreme values.Source: Wikipedia (CC BY-SA)
April 1
Day of the year
April 1 is the 91st day of the year in the Gregorian calendar; 274 days remain until the end of the year.Source: Wikipedia (CC BY-SA)