CHRONOLOGICAL CYCLES.-TIME.
Chronological Cycles.
Golden Number,..........
Epact,......
Solar Cycle,.....
31 Dominical Letter,.
22
Roman Indiction,.
25 Julian Period,.
C.B
7
6577
The Solar Cycle, or Cycle of the Sun, is a period of 28 years, after which all the Dominical Letters return in the same order as they did during the 28 years before. The first year of the Christian Era was the 10th of this Cycle.
The Lunar Cycle, or Cycle of the Moon, commonly called the Golden Number, and sometimes the Metonic Cycle (from Meton, an Athenian philosopher, who invented it about 432 years before the Birth of Christ) is a revolution of 19 years, in which time the conjunc tions, oppositions, and other aspects of the Moon are within an hour and a half of being the same as they were on the same days of the months 19 years before. The Prime, or Golden Number, is the number of years elapsed in this Cycle. Before the Birth of Christ two years of this Cycle had elapsed.
The Roman Indiction is a period of 15 years, used by the Romans for the time of taxing their Provinces. Three years of one of these Cycles had elapsed before the Birth of Christ.
The Julian Period contains 7980 years, and arises from multiplying together 28.19, and 15. being the Cycles of the Sun, Moon, and Indiction. This was contrived by Joseph Juste Scaliger in 1533 for Chronological purposes, and is assumed as a fixed Era in calcu lations by all Astronomers and Chronologers throughout the Christian world. Its begin- ning is placed 710 years before the usual date of the Creation of the world, or 4714 before the commencement of the Christian Era.
TIME. Days.
Hrs. Min. Sec.,
24,
23, 56, 4.09
24, 52,
24, 48,
A Solar (average) day is.....
A Sidereal day is...
A Lunar (average) Day is. An average Tidal Day is..
Months.
Days, Hours, Min.
Sec.
A Lunar sidereal Month is.
27
7 43
11.5
synodic tropical
""
99
anomalistic
""
nodal
29
29 12
44
2.87
.27
7
43
4.7
27 13
18
37.4
.27
5
5
36.
Moons inclination to the Ecliptic,.
.་
"
Excentricity,
Distance from the earth in radii.
50
8
47.9
0.0548442
60.67
Year.
Days, Hours, Min. Sec.
The Anomalistic year is.
365
6
13 49.3
A Sidereal year is
.365
6
9 10.7
A Common, or Tropical year is..
365
5
48 49.7
A Lunar year is..
354
8
48 34.44
Length of the Seasons.
Spring. Summer..
Autumn.. Winter....
.92 days 22 hours 12 min.
.93
13
32
""
""
""
89
.89
""
16 1
20
43
**
19
}
No comments yet.
Private notes are available after approval.