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Page 193 As an example, the Julian Day number system defines its day 0 to be 1 January 4712. Applying the rules of the Gregorian calendar, this date is 24 November 4713, a date 38 days before the zero point. Hence, the error of 38 days must be added to the Gregorian proleptic date to obtain the Julian date. Note that the table may also be used to obtain proleptic Julian dates from Gregorian dates. As an example, the Gregorian date 15 October 1582 may be converted to its corresponding Julian proleptic date of 05 October 1582 by adding 10 days. The error term may be computed for any arbitrary century term by the formula: where c is the century term as defined, the division operator (/) performs integer division, which truncates the remainder, and e is the error term as defined. (continued) Table 7.1 Century Error Dates +11 07 1000 MAR 01 to 1100 FEB 28 +12 07 1100 MAR 01 to 1200 FEB 28 +13 08 1200 MAR 01 to 1300 FEB 28 +14 09 1300 MAR 01 to 1400 FEB 28 +15 10 1400 MAR 01 to 1500 FEB 28 +16 10 1500 MAR 01 to 1600 FEB 28 +17 11 1600 MAR 01 to 1700 FEB 28 +18 12 1700 MAR 01 to 1800 FEB 28 +19 13 1800 MAR 01 to 1900 FEB 28 +20 13 1900 MAR 01 to 2000 FEB 28 +21 14 2000 MAR 01 to 2100 FEB 28 +22 15 2100 MAR 01 to 2200 FEB 28 +23 16 2200 MAR 01 to 2300 FEB 28 +24 16 2300 MAR 01 to 2400 FEB 28 +25 17 2400 MAR 01 to 2500 FEB 28 +26 18 2500 MAR 01 to 2600 FEB 28 +27 19 2600 MAR 01 to 2700 FEB 28 +28 19 2700 MAR 01 to 2800 FEB 28 +29 20 2800 MAR 01 to 2900 FEB 28
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