June 20, 1849
June 20, 1867
June 20, 1887
June 20, 1891
June 21
The summer solstice, or Alban Heruin, was the longest day of the year.
June 21, 1098
June 21, 1650
June 21, 1691
June 21, 1782
June 21, 1791
June 21, 1796
June 21, 1798