TABLE 830.— JULIAN DAY CALENDAR* 



733 



Days are numbered consecutively, beginning with the number 0, from Greenwich mean noon 

 on Jan. 1, 4713 B.C. The number of days since that time that have elapsed at Greenwich mean 

 noon on any given date is the Julian Day Number of that day. 



For A.D. to A.D. 1580 inclusive, the Julian Day Numbers in this table are the days elapsed 

 at Greenwich mean noon up to January of the Julian Calendar in each leap year. 



For 1584 to 2096 inclusive, the Julian Day Numbers are for January of the Gregorian Calen- 

 dar, except that in 1700, 1800, and 1900, which were not leap years, they are for January — 1. 



Days'to be added to reduce to the beginning of each month: For dates from 1582 October 15 

 to 1583 December 31, inclusive, Gregorian Calendar, diminish all numbers in this table by 10. 



In 1700, 1800, and 1900, Gregorian Calendar, for January use the number 1 instead of the 

 tabular value 0,'and for February use 32 instead of 31. 



§ Gregorian Calendar. 

 SMITHSONIAN PHYSICAL TABLES 



