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.

Unless otherwise indicated, for events in England, the date given is Old Style, 10 days behind the Dutch Republic's New Style until 1700 and then 11 days behind.

Date
July 13, 1649 great-aunt Aaltge Sebastians van den Berch's estate divided
October 4, 1650 sister Neeltje Philips Leeuwenhoek buried in Nieuwe Kerk
December 21, 1650 In 2nd stadthouderless period, Delft granted charter for an independent Veertigraad
August 2, 1651 niece Maria Elsevier married Jan Strick
October 28, 1651 cousin Maerten Huijchs Leeuwenhoek married Jennitgen (Johanna) Vosmaer
January 1, 1652 mentor William Davidson remarried and moved to Nieuwe Eylant
March 31, 1652 cousin Lambrecht Huijchs Leeuwenhoek married Adriaentgen Cornelis van Spaendonck
June 4, 1652 wife's great-uncle Elezaar Hendriks Swalmius buried
April 5, 1653 Jan (Johannes) Reijniers Vermeer married Catharina Bolnes
April 9, 1653 cousin Lambrecht's son Anthonij Lambrechts Leeuwenhoek (1653-1671) baptized
May 5, 1653 Got power of attorney for William Davidson during first Anglo-Dutch war (1652-54)
October 21, 1653 wife Barbara de Meij and sister-in-law Maria de Meij made a will
November 23, 1653 cousin Magdaleentje (Helena) Maertens Leeuwenhoek (1653-1720) baptized
July 29, 1654 Married Barbara de Meij
October 6, 1654 Signed as brother-in-law of Maria de Meij when she bought a house on the Oosteinde
October 12, 1654 Delft Thunderclap: fire following explosion killed 1200 people and destroyed much of Delft
January 1, 1655 cousin Abraham's son Pieter Abrahams Hogenhouck (-1679) appointed magistrate
January 1, 1655 Paid his entry fee to the Sint Nicolaas Gilde
January 24, 1655 Jan Strick appointed camerbewaarder of the magistrate's chamber
February 2, 1655 wife Barbara de Meij revoked her pre-marital will
February 16, 1655 Bought the house and shop on the west side of the Hippolytusbuurt
March 17, 1655 sister Catharina Philips Leeuwenhoek (1637- after 1684) married Claes Jans van Leeuwen
April 25, 1655 nephew Jacob Jans de Molijn baptized
May 7, 1655 Made mortgage payment (first of eight) on the Gulden Hoofd
May 11, 1655 Inherited property on Oosteinde from first wife Barbara de Meij's family
June 21, 1655 mentor Cornelis 's Gravesande graduated from medical school
September 15, 1655 son Philips Leeuwenhoek (first so named) baptized, buried six weeks later
January 11, 1656 Borrowed 600 gulden from his mother
March 20, 1656 cousin Cornelis Maertens Hogenhouck buried in Oude Kerk
June 18, 1656 nephew Anthonij Jans de Molijn (1656-1729) baptized, witnessed by Antony
September 24, 1656 daughter Maria Thonis Leeuwenhoek (1656-1745) baptized
November 10, 1656 cousin Maria Maertens Leeuwenhoek (1656-1717) baptized
December 26, 1656 Jan Strick, camerbewaarder of the magistrates' chamber, received a raise of 19 guilders
February 8, 1657 cousin Russje Lambrechts Leeuwenhoek (1657-1746) baptized
May 8, 1657 Made mortgage payment (second of eight) on the Gulden Hoofd
February 26, 1658 mother Margrietke testified for a legal action by Johan Strick
February 27, 1658 mentor Dr. Cornelis 's Gravesande married Sara Ipelaer
May 8, 1658 Made mortgage payment (third of eight) on the Gulden Hoofd
September 1, 1658 Registered as a member of the Hervormde Gemeente Delft (Reformed Church in Delft)
September 29, 1658 daughter Margriete Thonis Leeuwenhoek baptized, then buried a week later
May 30, 1659 Made mortgage payment (fourth of eight) on the Gulden Hoofd
December 19, 1659 Issued receipts to two nephews for dry goods
January 24, 1660 Received payment from city for duties with magistrate's court
January 28, 1660 co-worker Daniel Bogaert married Annetge Willems van Schie
March 26, 1660 Appointed official of city magistrate's court
May 11, 1660 Made mortgage payment (fifth of eight) on the Gulden Hoofd
September 14, 1660 Compensated by city for expenses building wing for bridge
October 17, 1660 cousin Jannitgen Huijchs Leeuwenhoek (1633-1681) married Lucas Pieters van Kessel
January 1, 1661 father-in-law Johannes Swalmius buried
January 17, 1661 wife Cornelia Swalmius made a will before marrying Leeuwenhoek
January 23, 1661 niece Geertruijt Jans de Molijn (1661-1736) baptized, witnessed by Antony and Barbara
January 24, 1661 Official due date of his annual payment from the city for his duties with the magistrate's court
March 26, 1661 mentor Dr. Cornelis 's Gravesande appointed City anatomist
April 28, 1661 Recieved payment for his duties with the magistrates' court
May 11, 1661 Made mortgage payment (sixth of eight) on the Gulden Hoofd
June 8, 1661 mentor Dr. Cornelis 's Gravesande married Agatha van Schagen
December 18, 1661 cousin Margrieta Maertens Leeuwenhoek baptized
December 30, 1661 Received a raise from the mayors for his duties with the magistrates' court
January 13, 1662 aunt Annetje Jacobs van den Berch died, leaving money to Antony
January 24, 1662 Official due date of his salary from the city for his duties with the magistrate's court
March 3, 1662 Made mortgage payment (seventh of eight) on the Gulden Hoofd
April 19, 1662 Made mortgage payment (last of eight) on the Gulden Hoofd
July 2, 1662 cousin Adriaen Lambrechts Leeuwenhoek (1662-1739) baptized
October 23, 1662 Made will in which he and wife Barbara named each other universal heirs
October 29, 1662 cousin Petronella Johans Strick baptized, witnessed by Antony
January 1, 1663 Christiaen Anhaltin's School-Boeck van de Wyn-Royeryen published
January 25, 1663 son Philips Leeuwenhoek (second) baptized, buried three weeks later
April 25, 1663 brother-in-law Adriaan Johannes Swalmius (1631-1667) married Margrieta van der Burch
July 2, 1663 Christiaan Huygens elected member of the Royal Society
August 1, 1663 Christiaan Huygens received letter from Gutschoven about how to grind small lenses

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