## Discipline Calendar

### practice mental arithmetic: Calendrical calculation - calculation of weekdays

The aim is to calculate the weekday of a given date as quickly as possible in your head. The base is the internationally used Gregorian calendar (according to Pope Gregory XIII). The calendar was introduced at the end of the 16th century due to a calendar reform. Under Calendrical Calculation Method you will find a description of how to calculate a date.

There are different disciplines:

• Weekdays - these are all years beginning with 1600 - 2099.
• Current century - as the name implies, only data from the current century.
• Current year - as the name suggests, only data from the current year.

There are two different lengths, 1 minute and 5 minutes. The better you get, the higher will be your level.

### These are the different levels:

11001001002020
22002002004040
33003003006060
44004003828080
5500500482100100
6600600582120120
7655655682131131
870107010764142142
980108010864162162
1090109010964182182
11115101151014010242242
12140101401019010282282
13165101901024010364364
14190102401029010464464
15240102901034010564564
16290103401039010764764
17340104401044010846846
183901049010490101101011010
194401054010590101301013010
205000590106901016001600