events
Halley's Comet makes its closest approach to Earth at a distance equal to 0.0342 AU (5.1 million kilometres/3.2 million miles).
Related Wikipedia articles
Halley's Comet
Short-period comet visible every 75–77 years
Halley's Comet is the only known short-period comet that is consistently visible to the naked eye from Earth, appearing every 72–80 years, though with the majority of recorded apparitions occurring after 75–77 years. It last appeared in the inner parts of the Solar System in…Source: Wikipedia (CC BY-SA)
Astronomical unit
Mean distance between Earth and the Sun
The astronomical unit is a unit of length defined to be exactly equal to 149597870700 m. Historically, the astronomical unit was conceived as the average Earth-Sun distance, before its modern redefinition in 2012.Source: Wikipedia (CC BY-SA)
April 10
Day of the year
April 10 is the 100th day of the year in the Gregorian calendar; 265 days remain until the end of the year.Source: Wikipedia (CC BY-SA)