|
|
|
|
|
|
|
GMT
See Greenwich Mean Time. |
|
|
|
|
|
|
|
|
Golden number
The numerus aureus is the number of a year in the Metonic cycle of 19 years. The number is calculated as the remainder of the operation (n + 1)/19, for a given year n in the Christian era. The number figured prominently in medieval calculations of Easter date. The term golden may refer to its importance or to the color of ink used for illumination of manuscripts in which the number figured. |
|
|
|
|
|
|
|
|
Greenwich Mean Time (GMT)
A somewhat ambiguous term, which is normally taken to be the same as UTC. This term is not in current technical use. |
|
|
|
|
|
|
|
|
Gregorian
The ecclesiastical reform calendar that replaced the Julian calendar, effective A.D. 1582 October 15. The reform added 10 days to the calendar date to bring the date of Easter back to the date intended by the Council of Nicaea and changed the beginning of the year to 1 January from 1 March. This reform was adopted immediately in Catholic countries but was involved in the political debates of the Reformation, so its adoption by other countries was delayed. |
|
|
|
|
|
|
|
|
Heliacal rising
Pertains to the rising of a star when it first emerges from the light of the Sun and becomes visible before sunrise. The term can also apply to the time of the setting of a star when it is last visible after sunset before being lost in the rays of the Sun. The term also applies to planets, such as Venus. When specifically applied to Sirius, the Dog Star, the heliacal year is also referred to as the canicular year. |
|
|
|
|
|
|
|
|
Holiday
Originally, a holy day or religious festival day now, a day on which work is suspended. |
|
|
|
|
|
|
|
|
Ides
In the Roman calendar, the eighth day after the Nones of a given month. This date is the equivalent of the 15th day of the month for the months of March, May, July, and October and the 13th day of the month for the other months. |
|
|
|
|
|
|
|
|
Immovable
In the context of feast, the term means a day observed by a fixed date rule. The earliest such dates were probably the anniversaries of Christian martyrs, kept at Rome from the third century, and in Asia Minor from the second century. Later, saint's days were celebrated on the day of the death (usually), the day of the translation of their relics, or (occasionally) another day, such as the date of birth. |
|
|
|
|
|
|
|
|
Indiction
A cycle of 15 years, instituted by Diocletian in the third century A.D. for taxation purposes, which later came to be used for chronological purposes in medieval Europe. This cycle is one of the three cycles used by Scaliger to create the Julian Day number. |
|
|
|
|
|