"1587: A year of no significance"
Ray Huang, 1981



Wanli (1573-1619), 14th Emperor of the Ming Dynasty


Magellan's Voyage 1519 - 1522



http://en.wikipedia.org/wiki/Ferdinand_Magellan


Matteo Ricci (1552-1610)

1582 in Macao



1582

Gregorian Calendar
(4-14 October, 1582 cancelled = from 3 oct. jumped to 15 Oct. 1582)



Inter Gravissimas, - Gregory XIII, February 24, 1581
http://personal.ecu.edu/mccartyr/intGrvEng.html



http://www.saintpetersbasilica.org/Monuments/GregoryXIII/GregoryXIII.htm


NO. 71.
http://www.saintpetersbasilica.org/floorplan.htm

In the British Calendar, September 2, 1752 was immediately followed by September 14, 1752
 because of the stipulation of the British Calendar Act of 1751.

http://scienceworld.wolfram.com/astronomy/GregorianCalendar.html

British Calendar Act of 1751
http://webexhibits.org/calendars/year-text-British.html



'Give us our eleven days!': calendar reform in eighteenth-century England
http://www.findarticles.com/p/articles/mi_m2279/is_n149/ai_17782422

George Washington was born on 11 February, 1732 on the Julian Calendar; Americans celebrate his birthday on 22 February.

In Russian calendar, only in 1917 were the days deducted from the calendar.

October Revolution happened in November according to the Gregorian Calendar.
On October 25 (November 7), 1917, Vladimir Lenin led his forces in the uprising in Petrograd, the capital of Russia,
against the ineffective Kerensky Provisional Government.

http://en.wikipedia.org/wiki/October_Revolution

Why was the Pope so powerful?
Why was the calculation of dates so important?
Why the British and the Russians did not follow he Pope's order to change their calendars?
The answers to all these questions have their roots in the events happened in the medieval period.




Source: http://en.wikipedia.org/wiki/Gregorian_calendar