9.00am (AEST) – Day 1 of the World Health Summit Regional Meeting to discuss local and regional health issues with speakers including Penny Wong and Helen Clarke (until 24 April) – Melbourne

10.00am (AEST) – The case of alleged mushroom lunch killer Erin Patterson is back in court for a special mention – Morewell, Vic

Sydney’s Katherine Bennell-Pegg will become the first-ever Australian-badged astronaut when she graduates from the European Space Agency in Germany today

Passover begins tonight (until 30 April)

Earth Day 

Birthdays for Jack Nicholson (1937), John Waters (1946), Daniel Johns (1979), and Amber Heard (1986)

Anniversary of:

• the birthdays of Immanuel Kant (1724),  Vladimir Lenin (1870), Sidney Nolan (1917) and Glen Campbell (1936)
• the death of Richard Nixon, 37th President of the USA (1994)
• the signing of the Paris Climate Agreement (2016)