Apollo Day was a Human holiday, an observance of the anniversary of their civilization's first visit to their moon, Luna, by spacecraft of the Apollo program.
History and specifics
On 20 July 1969, the spacecraft Apollo 11 landed a module on Luna, and that date now commemorates the event.
From the year 2269 to the early 2270s decade, the Apollo Tricentennial marked the 300th anniversary of this date and the ongoing Apollo moon landings, which went on until 1972. The celebration culminated in the flight of the space shuttle orbiter Enterprise on Apollo Day in 2272. (TOS - The Lost Years novel: A Flag Full of Stars)
- While the intention of the novel was to have the book take place on the tricentennial Apollo Day, 20 July 2269, the book was written before later timeline material contradicted that possibility. The Lost Years took place during the refit of the USS Enterprise prior to TOS movie, novelization & comic adaptation: The Motion Picture over the course of 2.5 years from 2270 to 2272. 2269 wouldn't fall into that range because the Enterprise was still in service at that time. Since the Apollo program moon landings took place over a number of years, this article uses that fact in consideration with the date assigned to the book by the later timeline materials.