| 1 February: | The thirty days of Ramadan in the Islamic year 944 begin at the first sighting of the lunar crescent. | |
| 3 March: | Muslims celebrate the Conclusion of the Fast on the first day of the month Shawwal. | |
| 26 March: | Jews celebrate Pesach for the next seven or eight days. | |
| 21 April: | The resurrection of Jesus Christ is celebrated Easter Sunday following the first full moon following the spring equinox as described by the Council of Nicaea in 325. | |
| 10 May: | Muslims celebrate the Festival of Sacrifice on the tenth day of the month Dhu al-Hijjah. | |
| 9 June: | Seven weeks after Easter Christians celebrate Pentecost, possibly since 68 AD. | |
| 14 September: | Jews celebrate Yom Kippur since sunset last night. | |
| 17 December: | Pope Paul III excommunicates king Henry VIII of England. |
Hans Holbein the Younger, John Taverner, Edward VI, John Rogers, Mikael Agricola, Nicolaus Copernicus, Michelangelo Buonarroti, Martin Luther, Henry VIII, Melanchthon, Charles V, Nostradamus, Francis Xavier, Alva, Andrea Palladio, John Calvin, Giorgio Vasari, Gerardus Mercator, Vesalius, Mary I, Antoine Perrenot de Granvelle, Tintoretto, Gaspard de Coligny, Takeda Shingen, Elizabeth I and William of Orange celebrated their birthday this year.
The year 1538 was a common year starting on a Tuesday, just like 1443, 1454, 1465, 1471, 1482, 1493, 1499, 1510, 1521 and 1527 in the century before it and 1549, 1555, 1566, 1577, 1585, 1591, 1602, 1613, 1619 and 1630 in the next.
The coloured days highlight
births
,
deaths
,
political
,
scientific
,
artistic
and
other
historical milestones, and recurring events such as anniversaries and
holidays
.
The new
,
waxing
,
full
and
waning
icons indicate the phases of the moon and appear only for dates in the Gregorian calendar, i.e. after 14 October 1582. The Chinese calendar is available only from 1645 to 2644, the first millenium since the last reform. The coloured columns mark the Sundays, the last day of the week per standard ISO-8601.
The normal calendar page for the current /year?2013 contains an introduction to the intriguing history of the year as we know it. The Calendar Converter has more detail. The so called Perpetual Calendar uses a trick from before the age of computers to find the weekday for any Gregorian date. Also see an overview of all historical events in the last six thousand years.