Final answer:
According to the "cosmic calendar," the first flower bloomed on the evening of December 31.
Step-by-step explanation:
The first flower bloomed according to the "cosmic calendar" on the evening of December 31, in the year compressed into 1 year. On this cosmic calendar, the time since the Big Bang is condensed into a year, and creatures we would call human do not emerge until the evening of December 31. This suggests that the origin of human beings occurred very close to the end of the cosmic year.