from Wikipedia, the free encyclopedia

Portal history | Portal Biographies | Current events | Annual calendar

| 16th century | 17th century | 18th century |
| 1580s | 1590s | 1600s | 1610s | 1620s | 1630s | 1640s |
◄◄ | | 1611 | 1612 | 1613 | 1614 | 1615 | 1616 | 1617 | 1618 | 1619 | | ►►

Heads of State · Nekrolog

Louis XIII
King Louis XIII get married ...
Anna of Austria
Anna of Austria .
Cape Horn seen from the sea
Willem Schouten and Jacob Le Maire discover Cape Horn .
Johannes Kepler
Astronomer Johannes Kepler publishes his barrel rule .
Hasekura Tsunenaga
Hasekura Tsunenaga visits Pope Paul V in Rome.
1615 in other calendars
Armenian calendar 1063/64 (turn of the year July)
Ethiopian calendar 1607/08 (September 11-12)
Bengali solar calendar 1020/21 (beginning of April 14th or 15th)
Buddhist calendar 2158/59 (southern Buddhism); 2157/58 (alternative calculation according to Buddha's Parinirvana )
Chinese calendar 71st (72nd) cycle

Year of the wooden hare乙卯 ( at the beginning of the year wooden tiger 甲寅)

Chula Sakarat (Siam, Myanmar) / Dai calendar (Vietnam) 977/978 (turn of the year April)
Dangun era (Korea) 3948/49 (October 2/3)
Iranian calendar 993/994
Islamic calendar 1023/24 (turn of the year January 30/31)
Jewish calendar 5375/76 (23/24 September)
Coptic calendar 1331/32 (September 11-12)
Malayalam calendar 790/791
Seleucid era Babylon: 1925/26 (turn of the year April)

Syria: 1926/27 (turn of the year October)

Vikram Sambat (Nepalese Calendar) 1671/72 (April)


Politics and world events


The Siege of Osaka


The double wedding of Bordeaux



Voyages of discovery

William Baffin
Location of Hudson Street


Johann von den Birghden

science and technology

Kepler's barrel rule

Johannes Kepler formulates the " Kepler barrel rule " for the approximate calculation of integrals in his work Nova Stereometria doliorum vinariorum ( New calculation of the contents of wine barrels ), in which he searches for verifiable methods for calculating the contents of wine barrels. One of the methods consists in approximating the curvature of the barrel by means of a parabola, since content calculations can be carried out precisely with the help of parabolas since Archimedes . Among other things, he describes a formula for calculating the capacity (more precisely the volume ) of wine barrels with irregular shapes. This formula provides exact values ​​for the truncated pyramid (including pyramid ), sphere , elliptical paraboloid , single-shell hyperboloid and all other body layers that can be created by plane body cuts perpendicular to the body axes. Since Kepler's barrel rule gives precise results for the volume of pyramids and tetrahedra , it can also be used without errors for Prismoid . It provides good approximations for barrels and barrel-shaped bodies and not too long tree trunks.

Title page of the first volume


Elias Holl




Date of birth saved

Exact date of birth unknown


Date of death secured

Memorial plaque on Markt 6, in Lutherstadt Wittenberg

Exact date of death unknown

Web links

Commons : 1615  - collection of pictures, videos and audio files