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User:Adhemar/Calendar snippets

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This page contains a 5 calendar snippets. Each is a sequence of 6 consecutive days. It is intended as an illustration for:

  • the absence of year 0 in the historian’s way of counting the year; and the inclusion in the astronomer’s way
  • the use of the Gregorian calendar proleptically in ISO 8601:2004
  • the use of Lady Day as the first day of the year by the Venerable Bede
  • the difference between the Before Christ convention as currently used today and Bede’s ante Incarnationis Dominicæ tempus
  • the discrepancy between the actually used Roman calendar and the Julian calendar (as intended) up until the day before the Kalends of March in the year when Cossus Cornelius Lentullus and Lucius Calpurnius Piso were consuls
  • the fact that 1 B.C. is a leap year in both the Julian and the Gregorian calendar, but wasn’t actually a bissextile year in the then observed Roman calendar
Weekday
Julian day at noon
Roman Bede Historians
Julian calendar
Astronomers
Julian calendar
ISO 8601
Proleptic Gregorian calendar
Tue.
1 721 056
4 Kal. Jan. Augustus & Silvanus
29 Dec. 752 A.U.C.
30 Dec. 2 a.I.D.t. 30 Dec. 2 B.C. 30 Dec. -1 -0001-12-28
Wed.
1 721 057
3 Kal. Jan. Augustus & Silvanus
30 Dec. 752 A.U.C.
31 Dec. 2 a.I.D.t. 31 Dec. 2 B.C. 31 Dec. -1 -0001-12-29
Thu.
1 721 058
prid. Kal. Jan. Augustus & Silvanus
31 Dec. 752 A.U.C.
1 Jan. 2 a.I.D.t. 1 Jan. 1 B.C. 1 Jan. 0 -0001-12-30
Fri.
1 721 059
Kal. Jan. Lentulus & Piso
1 Jan. 753 A.U.C.
2 Jan. 2 a.I.D.t. 2 Jan. 1 B.C. 2 Jan. 0 -0001-12-31
Sat.
1 721 060
4 Non. Jan. Lentulus & Piso
2 Jan. 753 A.U.C.
3 Jan. 2 a.I.D.t. 3 Jan. 1 B.C. 3 Jan. 0 0000-01-01
Sun.
1 721 061
3 Non. Jan. Lentulus & Piso
3 Jan. 753 A.U.C.
4 Jan. 2 a.I.D.t. 4 Jan. 1 B.C. 4 Jan. 0 0000-01-02
Fri.
1 721 115
4 Kal. Mar. Lentulus & Piso
26 Feb. 753 A.U.C.
27 Feb. 2 a.I.D.t. 27 Feb. 1 B.C. 27 Feb. 0 0000-02-25
Sat.
1 721 116
3 Kal. Mar. Lentulus & Piso
27 Feb. 753 A.U.C.
28 Feb. 2 a.I.D.t. 28 Feb. 1 B.C. 28 Feb. 0 0000-02-26
Sun.
1 721 117
prid. Kal. Mar. Lentulus & Piso
28 Feb. 753 A.U.C.
29 Feb. 2 a.I.D.t. 29 Feb. 1 B.C. 29 Feb. 0 0000-02-27
Mon.
1 721 118
Kal. Mar. C.Cæsar & Paullus
1 Mar. 753 A.U.C.
1 Mar. 2 a.I.D.t. 1 Mar. 1 B.C. 1 Mar. 0 0000-02-28
Tue.
1 721 119
6 Non. Mar. Lentulus & Piso
2 Mar. 753 A.U.C.
2 Mar. 2 a.I.D.t. 2 Mar. 1 B.C. 2 Mar. 0 0000-02-29
Wed.
1 721 120
5 Non. Mar. Lentulus & Piso
3 Mar. 753 A.U.C.
3 Mar. 2 a.I.D.t. 3 Mar. 1 B.C. 3 Mar. 0 0000-03-01
Mon.
1 721 139
11 Kal. Apr. Lentulus & Piso
22 Mar. 753 A.U.C.
22 Mar. 2 a.I.D.t. 22 Mar. 1 B.C. 22 Mar. 0 0000-03-20
Tue.
1 721 140
10 Kal. Apr. Lentulus & Piso
23 Mar. 753 A.U.C.
23 Mar. 2 a.I.D.t. 23 Mar. 1 B.C. 23 Mar. 0 0000-03-21
Wed.
1 721 141
9 Kal. Apr. Lentulus & Piso
24 Mar. 753 A.U.C.
24 Mar. 2 a.I.D.t. 24 Mar. 1 B.C. 24 Mar. 0 0000-03-22
Thu.
1 721 142
8 Kal. Apr. Lentulus & Piso
25 Mar. 753 A.U.C.
25 Mar. 1 a.I.D.t. 25 Mar. 1 B.C. 25 Mar. 0 0000-03-23
Fri.
1 721 143
7 Kal. Apr. Lentulus & Piso
26 Mar. 753 A.U.C.
26 Mar. 1 a.I.D.t. 26 Mar. 1 B.C. 26 Mar. 0 0000-03-24
Sat.
1 721 144
6 Kal. Apr. Lentulus & Piso
27 Mar. 753 A.U.C.
27 Mar. 1 a.I.D.t. 27 Mar. 1 B.C. 27 Mar. 0 0000-03-25
Thu.
1 721 422
3 Kal. Jan. Lentulus & Piso
30 Dec. 753 A.U.C.
30 Dec. 1 a.I.D.t. 30 Dec. 1 B.C. 30 Dec. 0 0000-12-28
Fri.
1 721 423
prid. Kal. Jan. Lentulus & Piso
31 Dec. 753 A.U.C.
31 Dec. 1 a.I.D.t. 31 Dec. 1 B.C. 31 Dec. 0 0000-12-29
Sat.
1 721 424
Kal. Jan. C.Cæsar & Paullus
1 Jan. 754 A.U.C.
1 Jan. 1 a.I.D.t. 1 Jan. A.D. 1 1 Jan. 1 0000-12-30
Sun.
1 721 425
4 Non. Jan. C.Cæsar & Paullus
2 Jan. 754 A.U.C.
2 Jan. 1 a.I.D.t. 2 Jan. A.D. 1 2 Jan. 1 0000-12-31
Mon.
1 721 426
3 Non. Jan. C.Cæsar & Paullus
3 Jan. 754 A.U.C.
3 Jan. 1 a.I.D.t. 3 Jan. A.D. 1 3 Jan. 1 0001-01-01
Tue.
1 721 427
prid. Non. Jan. Vinicius & Varus
4 Jan. 754 A.U.C.
4 Jan. 1 a.I.D.t. 4 Jan. A.D. 1 4 Jan. 1 0001-01-02
Tue.
1 721 504
11 Kal. Apr. C.Cæsar & Paullus
22 Mar. 754 A.U.C.
22 Mar. 1 a.I.D.t. 22 Mar. A.D. 1 22 Mar. 1 0001-03-20
Wed.
1 721 505
10 Kal. Apr. C.Cæsar & Paullus
23 Mar. 754 A.U.C.
23 Mar. 1 a.I.D.t. 23 Mar. A.D. 1 23 Mar. 1 0001-03-21
Thu.
1 721 506
9 Kal. Apr. C.Cæsar & Paullus
24 Mar. 754 A.U.C.
24 Mar. 1 a.I.D.t. 24 Mar. A.D. 1 24 Mar. 1 0001-03-22
Fri.
1 721 507
8 Kal. Apr. C.Cæsar & Paullus
25 Mar. 754 A.U.C.
25 Mar. A.D. 1 25 Mar. A.D. 1 25 Mar. 1 0001-03-23
Sat.
1 721 508
7 Kal. Apr. C.Cæsar & Paullus
26 Mar. 754 A.U.C.
26 Mar. A.D. 1 26 Mar. A.D. 1 26 Mar. 1 0001-03-24
Sun.
1 721 509
6 Kal. Apr. C.Cæsar & Paullus
27 Mar. 754 A.U.C.
27 Mar. A.D. 1 27 Mar. A.D. 1 27 Mar. 1 0001-03-25

Abbreviations

  • Kal. = Kalends
  • Non. = Nones
  • prid. = pridie = the day before
  • B.C. = Before Christ (or Before the Common era)
  • A.D. = Anno Domini = Year of the Lord
  • a.I.D.t. = ante Incarnationis Dominicæ tempus = before the time of the Lordly Incarnation
  • A.U.C. = Ab Urbe Condita = since the Foundation of the City (of Rome) (after Varro)

Conventions

  • red line = epoch (start of new era)
  • blue line = (start of) new year number (but not epoch)