A total solar eclipse occurred on April 8 New Style (NS), 1652, a Monday. In contemporary British sources, the date is alternately listed as March 29, 1652 following the Old Style (OS) as Great Britain had not yet adopted of the Gregorian Calendar by that time.[1][2] 19th century authors further adjusted the date to March 25 NS, 1652 so that it also fell on a Monday [3], but exactly two weeks before the solar eclipse! By the way it was the full moon and at the end of the night of March 25 NS, i.e. Monday March 15 OS, a lunar eclipse have taken place causing a possible confusion of the historians.