Experts have known that Van Gogh’s painting of a field of haystacks in Provence, France, was painted “sometime in the summer of 1889, toward the end of the most productive, but troubled, period of the artist’s life. However, the precise date of its creation has vexed art historians for many years. Now, Southwest Texas State University astronomers Russell Doescher and Donald Olson, along with Olson’s wife, Marilyn, an English professor, have determined that Van Gogh was working on the picture at 9:08 p.m. on July 13, 1889.”