Leap year starting on Sunday


A leap year starting on Sunday is any year with 366 days that begins on Sunday, 1 January, and ends on Monday, 31 December. Its dominical letters hence are AG, such as the years 1888, 1928, 1956, 1984, 2012, 2040, 2068, 2096, 2108, 2136, 2164, and 2192 in the Gregorian calendar or, likewise, 1996 and 2024 in the obsolete Julian calendar.
This leap year uniquely has the most occurrences of Friday the 13th. Common years starting on Thursday share this characteristic. Each instance of Friday the 13th is three months apart in January, April, and July.

Calendars

Applicable years

Gregorian Calendar

Leap years that begin on Sunday, along with those that start on Friday, occur most frequently: 15 out of the 97 total leap years in a 400-year cycle of the Gregorian calendar. Thus, the overall occurrence is 3.75%.
Decade1st2nd3rd4th5th6th7th8th9th10th
17th century1612164016681696
18th century1708173617641792
19th century1804183218601888
20th century192819561984
21st century2012204020682096
22nd century2108213621642192

Julian Calendar

Like all leap year types, the one starting with 1 January on a Sunday occurs exactly once in a 28-year cycle in the Julian calendar, i.e. in 3.57% of years. As the Julian calendar repeats after 28 years that means it will also repeat after 700 years, i.e. 25 cycles. The year's position in the cycle is given by the formula + 1).
Decade1st2nd3rd4th5th6th7th8th9th10th
15th century1408143614641492
16th century152015481576
17th century1604163216601688
18th century1716174417721800
19th century182818561884
20th century1912194019681996
21st century202420522080
22nd century2108213621642192