The Trinity test, the first detonation of a nuclear weapon, took place at the Alamogordo Bombing Range in New Mexico. It is widely believed that Oppenheimer named the test 'Trinity' as a reference to a poem by John Donne that Jean Tatlock had introduced him to, as a tribute to her.

Jean Tatlock died by suicide in her apartment in San Francisco. Her father discovered her body the following day. This event is significant due to the circumstances surrounding her death, her relationship with Oppenheimer, and subsequent conspiracy theories suggesting foul play.

J. Robert Oppenheimer met with Jean Tatlock in San Francisco while he was in Berkeley to recruit David Hawkins for the Manhattan Project. They spent the night together at Tatlock's apartment, during which she confessed her continued love for him. This was their last meeting.

J. Robert Oppenheimer married Kitty Harrison. This event is significant as it marks a turning point in Oppenheimer's personal life and occurred while he was still involved with Jean Tatlock. Their relationship continued sporadically after this date.

Jean Frances Tatlock was born in Ann Arbor, Michigan. She was the daughter of John Strong Perry Tatlock, a professor of English, and Marjorie Fenton. This date marks the beginning of the life of a woman who would become a psychiatrist and have a significant, albeit controversial, relationship with J. Robert Oppenheimer.