Chronology of events:

For some events, the year is certain but the month and day are not. Example: We know only the year for the collections of Leeuwenhoek's letters published in Dutch during his lifetime. For other events, the season or month are certain but the day is not. Example: Leeuwenhoek mentions that someone visited him "last month".

On the other hand, many events did indeed happen on the first day of a month. Example: public appointments to Delft's city offices took effect on January 1 of each year. Thus:

  • A date of January 1 in a given year may indicate that the year is certain but the month and day are not.
  • A date of 1 in a given month may indicate that the year and month are certain but the day is not.
Date
January 1, 1625 great-uncle Maarten Sebastians van den Berch (-1638) appointed to Veertigraad
January 1, 1626 great-uncle Cornelis Sebastians van den Berch de oude died after 1626
January 6, 1626 sister Geertruijt Philips Leeuwenhoek (1626- before 1649) baptized
September 27, 1626 sister-in-law Maria de Meij (1626-1676) baptized in Nieuwe Kerk
July 31, 1627 great-grandmother Neeltje Jans Hogenhouck buried in Oude Kerk
May 11, 1628 sister Neeltje Philips Leeuwenhoek (1628-1650) baptized in Nieuwe Kerk
May 30, 1628 cousin Geertruijt Huijchs Leeuwenhoek (1628-1684) baptized
December 20, 1629 wife Barbara de Meij (1629-1666) baptized in Nieuwe Kerk
April 1, 1630 sister Maria Philips Leeuwenhoek (1630- before 1643) baptized in Nieuwe Kerk
April 10, 1630 in-laws Johannes Swalmius and Margriete Uuytenbroucx married
November 23, 1630 uncle Cornelis Jacobs van den Berch married Elisabeth Heyndrics van Waert
January 1, 1631 brother-in-law Adriaan Johannes Swalmius (1631-1667) baptized
February 13, 1631 cousin Maerten Huijchs Leeuwenhoek (1631-1694) baptized
May 18, 1631 mentor Cornelis 's Gravesande baptized
November 21, 1631 step-grandmother Agniesgen Bastiaens, widow of grandfather Thonis Phillips Leeuwenhoek (-1643) buried in Nieuwe Kerk
January 1, 1632 Verponding 1632-1654 paid by various family members as noted
October 24, 1632 Born on Oosteinde
October 31, 1632 Jan Vermeer baptized in Nieuwe Kerk
November 4, 1632 Baptized in Nieuwe Kerk
January 1, 1633 Adrian Metius' Manuale arithmeticae & geometrice practicae published
April 24, 1633 uncle Jan Jacobs van den Berch married Annetje Claes Brugmans
October 20, 1633 father-in-law Elias de Meij made a will
November 13, 1633 cousin Jannitgen Huijchs Leeuwenhoek (1633-1681) baptized
March 5, 1634 great-uncle Jan Philips Leeuwenhoek married Geertruijt Arijens
April 9, 1634 wife Cornelia Johannes Swalmius (1634-1694) baptized in Valkenburg
July 23, 1634 aunt Cornelia Jacobs van den Berch married Simon Elsevier
October 1, 1634 aunt Catharina Jacobs van den Berch married Pieter Maurits Douchy
July 27, 1636 cousin Pieter Abrahams Hogenhouck married Catharijna Harmens van Ruijven
August 10, 1636 co-worker Daniel Bogaert baptized
April 30, 1637 cousin Adriaan Maertens Hogenhouck buried in Nieuwe Kerk
May 24, 1637 sister Catharina Philips Leeuwenhoek (1637- after 1684) baptized
May 31, 1637 cousin Margaretha (Grietjen) Huijchs Leeuwenhoek (1637-1702) baptized
November 26, 1637 aunt Annetje Jacobs van den Berch married Maerten Terseyden
December 1, 1637 father Philips Thonis Leeuwenhoek made a will in Den Haag
January 1, 1638 cousin Abraham Maertens Hogenhouck (1580-1641) appointed to Veertigraad
January 1, 1638 Haardstedenregister paid by various family members as noted
January 8, 1638 father Philips Thonis Leeuwenhoek buried in Nieuwe Kerk
March 10, 1638 cousin Jacob Maertens Hogenhouck buried in Oude Kerk
March 15, 1638 Regular canal boat service begun between Delft and Leiden
October 15, 1638 great-uncle Maarten Sebastians van den Berch buried in Oude Kerk
November 1, 1638 mother Margrietke Jacobs van den Berch presented father Philips Thonis Leeuwenhoek's will to the orphan chamber
January 1, 1639 cousin Abraham Maertens Hogenhouck (1580-1641) appointed magistrate
November 17, 1639 cousin Pieter Abrahams Hogenhouck purchased house on Koornmarkt
December 1, 1640 mother Margriete Jacobs van den Berch married Jacob Jans de Molijn
December 18, 1640 stepfather Jacob Jans de Molijn appeared before Weeskamer to appoint children's guardians
January 1, 1641 cousin Cornelis Maertens Hogenhouck (-1656) appointed to Veertigraad
January 1, 1641 Began attending school in Warmond
July 15, 1641 cousin Abraham Maertens Hogenhouck buried in Oude Kerk
January 1, 1643 cousin Pieter Abrahams Hogenhouck appointed to Veertigraad
February 10, 1643 great-aunt Neeltje Jacobs van Adrichem buried in Nieuwe Kerk
April 2, 1643 grandfather Thonis Phillips Leeuwenhoek (-1643) made a will
May 8, 1643 sister Margrieta Philips Leeuwenhoek married step-brother Jan Jacobs de Molijn
May 12, 1643 grandfather Thonis Phillips Leeuwenhoek buried in Nieuwe Kerk
January 1, 1644 Rene Descartes' Principia philosophiae (Principles of Philosophy) published
March 11, 1644 great-uncle Johan Sebastians van den Berch buried in Oude Kerk
December 29, 1644 brother-in-law Jan Jacobs Molijn permitted to become city painter
January 1, 1645 cousin Cornelis Maertens Hogenhouck (-1656) appointed magistrate
February 9, 1645 nephew Philips Jans de Molijn (1645 - ) baptized
January 1, 1646 Apprenticed with his uncle in Benthuizen
May 8, 1646 father-in-law Elias de Meij buried in Nieuwe Kerk
October 5, 1646 mother-in-law Maria Virljn registered Elias de Meij's 1633 will
May 12, 1647 niece Margrieta Jans de Molijn (1647 - ) baptized
October 8, 1647 sister Geertruijt Philips Leeuwenhoek married Jan (Johannes) Michiels van Schuijlenburg
January 1, 1648 Apprenticed at 16 in Amsterdam to Scottish linen merchant William Davidson
January 18, 1649 great-aunt Aaltge Sebastians van den Berch made will
May 2, 1649 stepfather Jacob Jans de Molijn (1594-1649) buried in Oude Kerk
May 3, 1649 great-aunt Aaltge Sebastians van den Berch buried in Oude Kerk
June 29, 1649 great-aunt Aaltge Sebastians van den Berch's estate items distributed
July 13, 1649 great-aunt Aaltge Sebastians van den Berch's estate divided
October 4, 1650 sister Neeltje Philips Leeuwenhoek buried in Nieuwe Kerk

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