12 moments
Birth in Taganrog
· Taganrog, Rostov Oblast, Russia

Wikimedia Commons · Attribution · file Chekhov was born in the southern Russian port city of Taganrog, the place of his childhood and schooling. Date is Gregorian/New Style as given in the English Wikipedia infobox; the article also gives 17 January Old Style.
Move to Moscow for medical school
· Moscow, Russia

Wikimedia Commons · PD-Old · file After completing school in Taganrog, Chekhov joined his family in Moscow and entered medical school, beginning the period in which he supported the household through writing.
Visit to Taganrog
· Taganrog, Rostov Oblast, Russia

Wikimedia Commons · Creative Commons Public Domain Mark 1.0 · file Chekhov wrote from Taganrog while traveling south through the Russian Empire. Letter date is reproduced as printed in the translated correspondence and may use the Russian Old Style calendar.
Stay at the Lintvaryovs' estate
· Sumy, Sumy Oblast, Ukraine

Wikimedia Commons · Creative Commons Attribution-Share Alike 4.0 International · file Chekhov was staying at the Lintvaryovs' estate near Sumy during a period of intensive writing and travel in Ukraine. The source supplies month, but not a day; coordinate represents Sumy because the estate is identified under that locality in the letter heading.
Sakhalin expedition
· Sakhalin Island, Russia

Wikimedia Commons · Public domain · file Chekhov undertook a demanding journey across Siberia to Sakhalin’s penal colony, where he spent three months interviewing convicts and settlers for a census. Coordinate is a representative point for the island; the source describes a three-month island-wide investigation.
Journey through Tomsk
· Tomsk, Tomsk Oblast, Russia
During his overland Siberian journey toward Sakhalin, Chekhov was in Tomsk and prepared to depart for Irkutsk. Letter date is reproduced as printed in the translated correspondence and may use the Russian Old Style calendar.
Arrival in Irkutsk
· Irkutsk, Irkutsk Oblast, Russia
Chekhov reached Irkutsk during the Siberian leg of his Sakhalin journey after traveling more than three thousand versts from Tyumen. Letter date is reproduced as printed in the translated correspondence and may use the Russian Old Style calendar.
Arrival on Sakhalin
· Sakhalin Island, Russia

Wikimedia Commons · Creative Commons Attribution-Share Alike 4.0 International · file Chekhov telegraphed his mother upon arriving safely on Sakhalin, where he would conduct his detailed investigation of penal-colony life. The telegram names only Sakhalin; coordinate is therefore a representative island point. Date is reproduced as printed and may use the Russian Old Style calendar.
Move to Melikhovo estate
· Melikhovo Estate, Moscow Oblast, Russia

Wikimedia Commons · Public domain · file Chekhov arrived at the Melikhovo estate, which became his principal country residence and the center of his medical, civic, and literary work through 1899. The preceding sentence identifies the year as 1892.
Pulmonary hemorrhage during Moscow visit
· Moscow, Russia

Wikimedia Commons · Creative Commons Public Domain Mark 1.0 · file While visiting Moscow, Chekhov suffered a major lung hemorrhage and entered a clinic, where physicians diagnosed tuberculosis and ordered changes to his way of life. The source supports month-level precision only.
Residence at the White Dacha
· White Dacha, Yalta, Crimea, Ukraine

Wikimedia Commons · Creative Commons Public Domain Mark 1.0 · file Chekhov moved with his mother and sister into the White Dacha at Yalta, his late-life residence and a major site of his final dramatic work. The preceding source sentence dates the land purchase and construction to 1898, making the stated move year 1899.
Death in Badenweiler
· Badenweiler, Baden-Württemberg, Germany

Wikimedia Commons · Public domain · file Chekhov died in the German spa town of Badenweiler while terminally ill with tuberculosis. The source gives both 15 July New Style and 2 July Old Style.