code: def _update_day_tracker_table(
              self):
          
          self.log.info('starting the ``_update_day_tracker_table`` method')
  
          # YESTERDAY MJD
          mjd = now(
              log=self.log
          ).get_mjd()
          yesterday = int(math.floor(mjd - 1))
  
          sqlQuery = u"""
              SELECT mjd FROM atlas_moving_objects.day_tracker order by mjd desc limit 1
          """ % locals()
          rows = readquery(
              log=self.log,
              sqlQuery=sqlQuery,
              dbConn=self.atlasMoversDBConn,
          )
          highestMjd = int(rows[0]["mjd"])
  
          converter = conversions(
              log=self.log
          )
  
          sqlData = []
          for m in range(highestMjd, yesterday):
              # CONVERTER TO CONVERT MJD TO DATE
              utDate = converter.mjd_to_ut_datetime(
                  mjd=m,
                  sqlDate=True,
                  datetimeObject=False
              )
              sqlData.append({
                  "mjd": m,
                  "ut_date": utDate
              })
  
          insert_list_of_dictionaries_into_database_tables(
              dbConn=self.atlasMoversDBConn,
              log=self.log,
              dictList=sqlData,
              dbTableName="day_tracker",
              uniqueKeyList=["mjd"],
              dateModified=False,
              batchSize=10000,
              replace=True
          )
  
          self.atlasMoversDBConn.commit()
  
          self.log.info('completed the ``_update_day_tracker_table`` method')
          return None
docs: * update day tracker table*
  
          **Key Arguments:**
              # -
  
          **Return:**
              - None
  
          **Usage:**
              ..  todo::
  
                  - add usage info
                  - create a sublime snippet for usage
                  - write a command-line tool for this method
                  - update package tutorial with command-line tool info if needed
  
              .. code-block:: python 
  
                  usage code