Public holidays
1666, Suisse, Aargau
| # | Date | Public holiday |
|---|---|---|
| 1 | Friday, 1 January 1666 | New Year's Day |
| 2 | Saturday, 2 January 1666 | Berchtold's Day |
| 3 | Friday, 16 April 1666 | Good Friday |
| 4 | Monday, 19 April 1666 | Easter Monday |
| 5 | Thursday, 27 May 1666 | Ascension Day |
| 6 | Monday, 7 June 1666 | Whit Monday |
| 7 | Thursday, 17 June 1666 | Corpus Christi |
| 8 | Sunday, 1 August 1666 | Swiss National Day |
| 9 | Sunday, 15 August 1666 | Assumption of Mary |
| 10 | Monday, 1 November 1666 | All Saints' Day |
| 11 | Wednesday, 8 December 1666 | Immaculate Conception |
| 12 | Saturday, 25 December 1666 | Christmas Day |
| 13 | Sunday, 26 December 1666 | Saint Stephen's Day |