Frequency of חזק's and סיומי דפ יומי

This coming שבת, the סיום דף יומי מסכת גיטין coincides with the חזק of finishing ספר שמות. See this fascinating article by R' Dovid Heber of the Star-K. In it, he shows that since the beginning of דף יומי there have in fact been the same number of סיומים as חזק's and goes through the numbers to show exactly why that is. עיין שם,

I decided to take this matter a little further and investigate how many times this has actually happened or will happen, assuming the exact structure of דף יומי remains the same. This is what I found, going back to the beginning in 1923 all the way to the year 2050:

Beitzah 40	1/16/2044	16 Teves	5804	Vayechi
Avodah Zarah 76	7/7/2040	26 Tammuz	5800	Matos Masei
Moed Katan 29	7/14/2029	2 Av	5789	Matos Masei
Gitin 90	3/12/2016	2 Adar II	5776	Pekudei
Shabbos 157	3/9/2013	27 Adar	5773	Vayakhel Pekudei
Kesubos 112	12/22/2007	13 Teves	5768	Vayechi
Yevamos 122	12/24/1977	14 Teves	5738	Vayechi
Temurah 34	7/7/1945	26 Tammuz	5705	Matos Masei

It is interesting to note that it does not occur on בחוקתי at all in this time, nor does it ever land on שמחת תורה. In fact, looking even further ahead, the only time it will ever land on שמחת תורה between now and the year 2200 will be the following on שמחת תורה in ארץ ישראל:

Horiyos 14

Thu Oct 26, 2062

22 Tishrei, 5823

For anyone curious as to how I was able to figure all this out, I wrote a very short and simple Java application and made use of the brilliant Zmanim API by KosherJava.

And if you're even more curious, here's my code:

import java.util.Calendar;

import java.util.Date;

import net.sourceforge.zmanim.hebrewcalendar.HebrewDateFormatter;

import net.sourceforge.zmanim.hebrewcalendar.JewishCalendar;

public class Daf {

      public static void main(String[] args) {

            int daf;

            HebrewDateFormatter hdf = new HebrewDateFormatter();

            Calendar day = Calendar.getInstance();

            day.set(Calendar.YEAR,2050);

            //System.out.println(day);

            boolean siyum=false;

            // While loop to expose all siyumim that happen on Shabbos. I have to go in manually afterwards to identify the chazaks.

            // I could have possibly used getParshaIndex() and played with that to expose just the chazaks but that would have been clunkier

            while (day.get(Calendar.YEAR) > 1922){

                  JewishCalendar jewCal = new JewishCalendar(day);           

                  try{

                      daf = jewCal.getDafYomiBavli().getDaf();

                  } catch (IllegalArgumentException iae){

                      break;

                  }

                  if (siyum){

                        if (day.get(Calendar.DAY_OF_WEEK) == Calendar.SATURDAY){

                       

                        System.out.println(jewCal.getDafYomiBavli().getMasechtaTransliterated() + " " +

                                    daf + ", " + day.getTime() + "," +  jewCal + "," + jewCal.getParshaIndex());

                        }

                        siyum=false;

                  }

                  if (daf == 2) siyum = true; //If today is the beginning of the masechta, yesterday was the siyum of the previous

                  day.add(Calendar.DAY_OF_YEAR, -1);

            }

            day.set(Calendar.YEAR,2200);

            //Separate loop to identify Simchas Torah since it isn't usually on Shabbos

            while (day.get(Calendar.YEAR) > 1922){

                  JewishCalendar jewCal = new JewishCalendar(day);           

                  try{

                      daf = jewCal.getDafYomiBavli().getDaf();

                  } catch (IllegalArgumentException iae){

                      break;

                  }

                  if (siyum){

                        // If the 22nd or 23rd day of Tishrei

                        if (jewCal.getJewishMonth() == 7 && (jewCal.getJewishDayOfMonth() == 22 || jewCal.getJewishDayOfMonth() == 23)){

                        System.out.println(jewCal.getDafYomiBavli().getMasechtaTransliterated() + " " +

                                    daf + ", " + day.getTime() + "," +  jewCal + "," + hdf.formatParsha(jewCal));

                        }

                        siyum=false;

                  }

                  if (daf == 2) siyum = true;

                  day.add(Calendar.DAY_OF_YEAR, -1);

            }           

      }

}