The planet Neptune was discovered by German astronomer Johann Galle, near Deneb Algedi (δ Capricorni) on 23 September 1846, as Capricornus can be seen best from Europe at 4:00am in September (although, by modern constellation boundaries established in the early 20th century CE, Neptune lay within the confines of Aquarius at the time of its discovery).
April 25 – A magnitude 7.8 earthquake strikes Nepal and causes 8,857 deaths in Nepal, 130 in India, 27 in China and 4 in Bangladesh with a total of 9,018 deaths.