January 28, 1986 was a Tuesday.
February 29th, 1985 was actually a leap year. So, this day of the week did not occur.
A week is larger than a day because a day has 24 hours but a week has 168.
A week is 7 days long, there is no 8th day in a week.
A day is one seventh of a week.
The Challenger Accident occured on Tuesday, January 28th, 1986.
The shuttle challenger, disintegrated after launch, killing all seven astronauts on board on Tuesday, January, 28, 1986.
September 11th can be on any day of the week
Tuesday- D-Day occurred on a Tuesday.
On Sabbaths and Jewish holidays. (The holidays can occur on any day of the week.)
The time of day or day of week does not seem to matter.
It was a Thursday.
This is Friday!