Beatrice Tinsley, New Zealand astronomer and cosmologist (died 1981)

Beatrice Muriel Hill Tinsley was a British-born New Zealand astronomer and cosmologist, and the first female professor of astronomy at Yale University, whose research made fundamental contributions to the astronomical understanding of how galaxies evolve, grow and die.

January 27 is the 27th day of the year in the Gregorian calendar; 338 days remain until the end of the year.