Here they are:
Here they are:180418081812181618201824182818321836184018441848185218561860186418681872187618801884188818921896
No, none of the leap years between 1890 and 1920 had the same calendar as 2012 had.
All the multiples of 4 are leap years, except for 1800 and 1900 (2000 is a leap year). I'll leave the counting to you.
almost everything... The major difference between the two calendars is the Julian calendar has 100 leap years in every 400 years, and the Gregorian calendar has 97 leap years in every 400 years. That makes the average length of a Julian calendar year 365.25 days and the average length of a Gregorian calendar year 365.2425 days. As a result, it takes only about 128 years for the Julian calendar to accumulate a full day of error, but for the Gregorian calendar to accumulate a full day of error takes about 3200 years.
Calendar, in the present context, refers to the Gregorian calendar, because it is the one used most frequently, worldwide. In a Gregorian calendar, centuries are not leap years unless divisible by 400 (Eg: The year 2000 is a leap year, whereas 1900 isn’t).As in the picture below, there can be only 14 calendar patterns - 1 to 14 (Years starting from Sunday to Saturday, either leap or non-leap year). Any calendar repeats in a minimum gap of 6 years and a maximum gap of 40 years. All the patterns 1 to 14 occur at least once in a minimum span of 25 years (Eg: 2000 - 2024) and a maximum span of 40 (Eg: 1889 - 1928).1. Repetition in the succeeding years:I. Calendars of non-leap years:A. Calendars of non-leap years of the form 4n and 4n+1 repeat after 6 years. Eg: Calendar of the year 1900 repeats in 1906; that of 2017 repeats in 2023.B. Calendars of non-leap years of the form 4n+2 and 4n+3 repeat after 11 years. 
Eg: Calendar of the year 2018 repeats in 2029; that of 2019 in 2030.Exception: The years of the 90s of a century ending in a non-leap year do not follow this pattern. Calendar of such a year Y repeats after(a) 12 years, if Y ∈ {90, 91, 97, 98}Eg: Calendar of the year 1890 repeats in 1902.(b) 6 years, if Y ∈ {93, 94, 95, 99}Eg: Calendar of the year 1895 repeats in 1901.II. Calendars of leap years:Calendar of a leap year repeats afterA. 40 years, in the 70s and 80s of a century ending in a non-leap year.Eg: Calendar of the year 1872 repeats in 1912.B. 12 years, in the 90s of a century ending in a non-leap year.Eg: Calendar of the year 1892 repeats in 1904.C. 28 years, otherwise.Eg: Calendar of the year 2020 repeats in 2048.Note: Combining I and II, this is the order of repetition of calendars of the 90s of a century ending in a non-leap year:12 12 12 6 6 6 12 12 12 62. Occurrence in the preceding years:I. Calendars of non-leap years:A. Calendars of non-leap years of the form 4n and 4n+3 are the same as that of the 6th preceding year. 
Eg: Calendar of the year 1900 is the same as that of 1894; that of 2019 is the same as that of 2013.B. Calendars of non-leap years of the form 4n+1 and 4n+2 are the same as that of the 11th preceding year.
Eg: Calendar of the year 2021 is the same as that of 2010; that of 2022 is the same as that of 2011.Exception: The first ten years of a century ending in a leap year do not follow this pattern. Calendar of such a year Y is the same as that of(a) the 6th preceding year, if Y ∈ {01, 05, 06, 07}Eg: Calendar of the year 1905 is the same as that of 1899.(b) the 12th preceding year, if Y ∈ {02, 03, 09, 10}Eg: Calendar of the year 1910 is the same as that of 1898.II. Calendars of leap years:Calendar of a leap year is the same as that ofA. the 40th preceding year, in the second and third decade of a century ending in a leap year. 
Eg: Calendar of the year 1916 is the same as that of 1876.B. the 12th preceding year, in the first decade of a century ending in a leap year.
 Eg: Calendar of the year 1908 is the same as that of 1896.C. the 28th preceding year, otherwise.
 Eg: Calendar of the year 2024 is the same as that of 1996.Note: Combining I and II, this is the order of the immediate preceding years in which calendars of the first decade (01-10) of a century ending in a leap year, are the same:6 12 12 12 6 6 6 12 12 12
The year 2000 was a leap year, so the use of a 2000 calendar is limited to leap years. Which are.... 2000, 2028, 2056, 2084.
The 2000 calendar will repeat in 2028. This was a leap year and leap year calendars generally repeat every 28 years.
No. 2000 was a leap year. Only 2016 and 2020 are leap years during that period and neither of them are the same as 2000 was. 2024 is also a leap year, but is not the same as 2000. 2028 will be the same.
The Julian calendar introduced by Julius Caesar had 365 days per year and 366 EVERY 4 years. This had allowed the calendar to creep out of line with the seasons. The Gregorian calendar we use now has the leap year rule: Every year that is exactly divisible by four is a leap year, except for years that are exactly divisible by 100; the centurial years that are exactly divisible by 400 are still leap years. For example, the year 1900 was not a leap year; the year 2000 was a leap year.
No, odd-numbered years are never leap years in either the Gregorian calendar or the Julian calendar.
Here they are:180418081812181618201824182818321836184018441848185218561860186418681872187618801884188818921896
242 or 243, depending on how many of the years (2 or 3) are evenly divisible by 400There can be either 242 or 243 leap years in any 1000-year period, depending on the number of leap centuries. The past 1000 years of the Gregorian calendar includes 243 leap years. The next 1000 years includes 242.
Julius Caesar introduced leap years when he reformed the Roman calendar in 46 BCE. His calendar, which is called the Julian calendar, was in use for almost 20 centuries. Beginning in 1582, it was eventually replaced by the Gregorian calendar, which is almost identical to the Julian calendar but is more accurate because it has fewer leap years.
Yes, if the year is divisible by 4 then it is a leap year with this exception:A century year (year ending in 00) is only a leap year if it is divisible by 400So the years 1800, 1900, 3000 are not leap years, for example, but the year 1600, 2000 were leap years and the year 2400 will also be a leap year, if we are still using the same calendar then.
2012 is a leap year. Leap years fall once every four years to keep our calendar years in sync with the seasons.
In the Gregorian calendar, No Only century years divisible by 400 are leap years.
The first leap year in the modern sense was 1752, when 11 days were 'lost' from the month September with the adoption of the Gregorian calendar by Britain and her colonies. After 1752 we adopted the system still in use today where an additional day is inserted in February in years wholly divisible by 4, other than years ending in 00 with the exception of those divisible by 400 which are still leap years (like 2000). This is certainly not the first use of leap years, the Julian calendar we used before 1752 had a simpler system of leap years, and remember, no calendar is universal.