Why Google does not show the dates between 5th October 1582 to 14th October 1582 ?

Why Google does not show the dates between 5^th October 1582 to 14^th October 1582 ?

When we discuss calendars, there is a wide range of calendars, including historical ones as well as proposed ones. Historical calendars are often grouped into larger categories by cultural sphere or historical period; thus, O Neil (1976) distinguishes between the groupings of Egyptian calendars (Ancient Egypt), Babylonian calendars (Ancient Mesopotamia), Indian calendars (Hindu and Buddhist traditions of the Indian subcontinent), Chinese calendars and Mesoamerican calendars.

Calendars used by different countries: -

Country	Calendar
Afghanistan	Solar Hijri Calendar
Bangladesh	Bangla Calendar
Ethiopia	Ethiopian Calendar
India	Indian National Calendar (Saka Samvat)
Israel	Hebrew Calendar
Japan	Japanese Calendar
Nepal	Vikram Samvat Calendar
North Korea	North Korea Calendar
Taiwan	Minguo Calendar
Thailand	Thai Solar Calendar

The calendar, we are going to discuss is the Gregorian Calendar, which is accepted by most countries in the world. It was introduced in October 1582 by the XIII Roman Pope Gregory as a modification of, and replacement for, the Julian calendar. The principal change was improvisation in the concept of leap years to make the average calendar year 365.2425 days long, more closely approximating the 365 days, 5 hours, 48 minutes, and 46 seconds, or 365.2422-days. 365.2422-days, the ‘tropical year' is the period of time required by the sun to pass from one vernal equinox to next vernal equinox. This time also known as 'solar year' or revolution time of the Earth around the Sun, is used to keep track of seasons, planting, and harvesting.

Why did we replace ‘Julian Calendar’ with ‘Gregorian Calendar’?

The calendar began with a calendar of 365 days per year. Our calendar year was shorter than the tropical year by 0.2422 days. So, to correct (approximately), we added 1 day every four years (leap year). Thus, three calendar years were 365 days long; the fourth calendar year was 366 days long. The average length of the calendar year in days now became: (3 x 365) + (366) / 4 = 365.25 days. 

This calendar system was instituted for use in the Roman Empire by Julius Caesar around 46 BC. But since the Julian calendar was 0.0078 days (11 minutes and 14 seconds) longer than the tropical year, errors in timekeeping gradually accumulated. Between 46 BC and 1582 AD, this accumulated error amounted to a total of: 0.0078 x (1582 + 46) = 12.7 days. In 1582, Pope Gregory XIII reformed the calendar by specifying that all years divisible by 4 are to be leap years except for century years, which must be divisible by 400 to be a leap year.

Now, in 1200 years:There were 300 leap years including all the century years and 900 years were ordinary years as out of 1200 years 900 years were not divisible by 4.

In the 1200 years, all century years were considered leap years but according to Gregorian’s theory, only 3 century years out of the 12 were actual leap years which were divisible by 400. So, this rule eliminated 9 leap years out of 1200 years.

Thus: 300 - 9 = 291 years were actual leap years and 909 years were the ordinary years.

The average length of the year now became (291 x 366) + (909 x 365) / 1200 = 365.2425 days, with an error of 365.2425 - 365.2422 = 0.0003 days per year, or one day every 3,333.3 yearsThe Gregorian calendar came into use in Roman Catholic countries in October 1582 when the seasons were brought back into step by eliminating 10 days from the calendar then in use. Thursday, October 4, was followed by Friday, October 15.

Calendar repeats after every:

400 Years or

20871 weeks or

146097 days.

By: Dheeraj Yadav

Competition Community [CoCo]

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