Table 6.13 -- EDCS Attributes whose label begins with J
| Label | Definition | Attribute value type | EQ label | Related concepts | Code |
| JULIAN_DATE_TT | The Julian date (terrestrial time) of any instant is the Julian day number for the preceding noon plus the fraction of the day since that instant. A Julian date (terrestrial time) begins at 12 hours 0 minutes 0 seconds, and the length of a day is 86 400 seconds. | REAL | PURE_NUMBER | 436 | |
| JULIAN_DAY | The Julian day number associated with the solar day which is the number assigned to a day in a continuous count of days beginning with the Julian day number "0" assigned to the day starting at Greenwich mean noon on 1 January 4 713 BC, Julian proleptic calendar -4 712. | INTEGER | PURE_NUMBER | 437 |