Saros 91

Catalog of Lunar Eclipses of Saros 91

Fred Espenak

Introduction

The periodicity and recurrence of lunar eclipses is governed by the Saros cycle, a period of approximately 6,585.3 days (18 years 11 days 8 hours). When two eclipses are separated by a period of one Saros, they share a very similar geometry. The two eclipses occur at the same node with the Moon at nearly the same distance from Earth and the same time of year due to a harmonic in three cycles of the Moon's orbit. Thus, the Saros is useful for organizing eclipses into families or series. Each series typically lasts 12 to 13 centuries and contains 70 or more eclipses. Every saros series begins with a number of penumbral lunar eclipses. The series will then produce several dozen partial eclipses, followed by several dozen total eclipses. The later portion of the series produces another set of partial eclipses before ending with a final group of penumbral eclipses.

Catalog of Lunar Eclipses of Saros 91

The table below lists the concise characteristics of every lunar eclipse belonging to Saros 91 . The date and time of each eclipse is given for the instant of Greatest Eclipse. For eclipses between the years -1999 to 3000, the calendar date links to a web page containing additional details along with a diagram of the eclipse geometry and a map showing the geographic region of eclipse visibility for that eclipse. A description of each parameter in the catalog table can be found in Key to Saros Catalog of Lunar Eclipses.

Catalog of Lunar Eclipses of Saros 91
Seq Num Rel Num Calendar Date TD of Greatest Eclipse ΔT

s
ΔT Sigma
s
Luna Num Ecl Type QSE Gamma Pen Mag Um Mag Pen Dur
m
Par Dur
m
Tot Dur
m
1-35 0179-Jun-0704:36:04 8787 215 -22518 N h- -1.4924 0.1219-0.8824 99.7 - -
2-34 0197-Jun-1711:34:03 8616 211 -22295 N a- -1.4107 0.2701-0.7310145.8 - -
3-33 0215-Jun-2818:35:43 8445 206 -22072 N a- -1.3308 0.4154-0.5831177.6 - -
4-32 0233-Jul-0901:43:10 8274 201 -21849 N a- -1.2546 0.5542-0.4422201.6 - -
5-31 0251-Jul-2008:55:28 8102 197 -21626 N a- -1.1812 0.6881-0.3067220.9 - -
6-30 0269-Jul-3016:16:22 7930 192 -21403 N a- -1.1138 0.8111-0.1827236.0 - -
7-29 0287-Aug-1023:44:04 7757 188 -21180 N a- -1.0513 0.9256-0.0675248.3 - -
8-28 0305-Aug-2107:21:57 7583 183 -20957 P a- -0.9960 1.0268 0.0341257.9 41.7 -
9-27 0323-Sep-0115:07:27 7409 179 -20734 P a- -0.9463 1.1180 0.1253265.6 78.7 -
10-26 0341-Sep-1123:04:24 7233 175 -20511 P a- -0.9053 1.1933 0.2005271.4 98.2 -
11-25 0359-Sep-2307:09:27 7057 171 -20288 P a- -0.8702 1.2577 0.2647275.8111.5 -
12-24 0377-Oct-0315:24:48 6880 166 -20065 P a- -0.8430 1.3078 0.3147278.9120.4 -
13-23 0395-Oct-1423:47:51 6702 162 -19842 P a- -0.8215 1.3473 0.3541281.1126.6 -
14-22 0413-Oct-2508:19:46 6524 158 -19619 P a- -0.8065 1.3748 0.3817282.3130.6 -
15-21 0431-Nov-0516:57:16 6346 154 -19396 P a- -0.7959 1.3938 0.4013282.9133.2 -
16-20 0449-Nov-1601:39:59 6168 150 -19173 P a- -0.7891 1.4059 0.4142283.1134.8 -
17-19 0467-Nov-2710:26:07 5990 146 -18950 P a- -0.7848 1.4132 0.4228282.9135.7 -
18-18 0485-Dec-0719:15:01 5814 142 -18727 P a- -0.7820 1.4173 0.4287282.5136.3 -
19-17 0503-Dec-1904:03:10 5637 139 -18504 P a- -0.7786 1.4225 0.4363282.1137.0 -
20-16 0521-Dec-2912:50:25 5460 135 -18281 P a- -0.7740 1.4294 0.4459281.9138.1 -
21-15 0540-Jan-0921:34:04 5285 131 -18058 P a- -0.7662 1.4422 0.4618282.0140.0 -
22-14 0558-Jan-2006:14:37 5111 127 -17835 P a- -0.7556 1.4599 0.4832282.5142.5 -
23-13 0576-Jan-3114:48:03 4938 124 -17612 P a- -0.7386 1.4891 0.5162283.6146.3 -
24-12 0594-Feb-1023:16:38 4766 120 -17389 P a- -0.7173 1.5261 0.5572285.2150.9 -
25-11 0612-Feb-2207:36:59 4596 117 -17166 P a- -0.6889 1.5762 0.6114287.4156.5 -
26-10 0630-Mar-0415:51:11 4427 113 -16943 P a- -0.6552 1.6360 0.6753290.0162.7 -
27 -9 0648-Mar-1423:56:12 4259 110 -16720 P a- -0.6134 1.7108 0.7540293.3169.5 -
28 -8 0666-Mar-2607:55:27 4093 106 -16497 P a- -0.5666 1.7947 0.8418296.6176.4 -
29 -7 0684-Apr-0515:46:49 3930 103 -16274 P a- -0.5128 1.8917 0.9421300.2183.3 -
30 -6 0702-Apr-1623:31:56 3768 100 -16051 T a- -0.4536 1.9987 1.0522303.8189.8 33.6
31 -5 0720-Apr-2707:11:07 3608 97 -15828 T a- -0.3894 2.1154 1.1712307.2195.8 58.7
32 -4 0738-May-0814:45:54 3451 94 -15605 T p- -0.3215 2.2389 1.2967310.2200.9 74.2
33 -3 0756-May-1822:17:13 3296 90 -15382 T- p- -0.2505 2.3686 1.4277312.8205.2 85.1
34 -2 0774-May-3005:44:50 3145 87 -15159 T- p- -0.1765 2.5040 1.5638314.9208.5 92.6
35 -1 0792-Jun-0913:11:54 2996 84 -14936 T- pp -0.1021 2.6405 1.7003316.4210.6 97.3
36 0 0810-Jun-2020:38:17 2851 82 -14713 T- pp -0.0274 2.7777 1.8370317.2211.7 99.4
37 1 0828-Jul-0104:05:52 2708 79 -14490 T+ pp 0.0461 2.7442 1.8021317.5211.6 99.1
38 2 0846-Jul-1211:35:18 2570 76 -14267 T+ -p 0.1179 2.6135 1.6695317.1210.5 96.5
39 3 0864-Jul-2219:08:50 2436 73 -14044 T+ -p 0.1860 2.4898 1.5432316.2208.5 91.8
40 4 0882-Aug-0302:47:02 2305 70 -13821 T+ -p 0.2497 2.3745 1.4248315.0205.8 85.0
Catalog of Lunar Eclipses of Saros 91
Seq Num Rel Num Calendar Date TD of Greatest Eclipse ΔT

s
ΔT Sigma
s
Luna Num Ecl Type QSE Gamma Pen Mag Um Mag Pen Dur
m
Par Dur
m
Tot Dur
m
41 5 0900-Aug-1310:30:03 2178 68 -13598 T -p 0.3091 2.2672 1.3140313.4202.4 76.1
42 6 0918-Aug-2418:19:45 2056 65 -13375 T -p 0.3626 2.1711 1.2139311.8198.7 65.0
43 7 0936-Sep-0402:16:09 1938 62 -13152 T -a 0.4102 2.0860 1.1244310.1194.8 51.0
44 8 0954-Sep-1510:20:07 1825 60 -12929 T -a 0.4511 2.0133 1.0472308.5191.0 32.2
45 9 0972-Sep-2518:30:48 1716 57 -12706 P -a 0.4859 1.9516 0.9808307.2187.3 -
46 10 0990-Oct-0702:49:22 1611 55 -12483 P -a 0.5138 1.9029 0.9275306.2184.2 -
47 11 1008-Oct-1711:14:47 1512 53 -12260 P -a 0.5357 1.8650 0.8850305.6181.6 -
48 12 1026-Oct-2819:46:07 1417 50 -12037 P -a 0.5522 1.8368 0.8525305.3179.5 -
49 13 1044-Nov-0804:23:12 1326 48 -11814 P -a 0.5636 1.8179 0.8296305.4178.1 -
50 14 1062-Nov-1913:04:02 1240 46 -11591 P -a 0.5717 1.8049 0.8130305.7177.2 -
51 15 1080-Nov-2921:48:21 1159 44 -11368 P -a 0.5763 1.7982 0.8030306.4176.8 -
52 16 1098-Dec-1106:32:25 1082 42 -11145 P -a 0.5808 1.7912 0.7933306.9176.4 -
53 17 1116-Dec-2115:17:48 1009 40 -10922 P -a 0.5839 1.7867 0.7866307.6176.2 -
54 18 1135-Jan-0200:00:10 941 38 -10699 P -a 0.5894 1.7774 0.7756308.1175.7 -
55 19 1153-Jan-1208:39:53 877 36 -10476 P -a 0.5965 1.7650 0.7620308.4175.0 -
56 20 1171-Jan-2317:13:07 816 34 -10253 P -a 0.6086 1.7432 0.7393308.2173.5 -
57 21 1189-Feb-0301:41:17 760 32 -10030 P -a 0.6245 1.7143 0.7099307.6171.3 -
58 22 1207-Feb-1410:01:06 707 30 -9807 P -a 0.6469 1.6733 0.6686306.3167.9 -
59 23 1225-Feb-2418:12:43 658 28 -9584 P -a 0.6756 1.6208 0.6161304.4163.0 -
60 24 1243-Mar-0802:14:39 611 27 -9361 P -a 0.7116 1.5547 0.5499301.4156.1 -
61 25 1261-Mar-1810:07:53 568 25 -9138 P -a 0.7540 1.4770 0.4721297.4146.9 -
62 26 1279-Mar-2917:50:46 528 23 -8915 P -a 0.8041 1.3851 0.3800292.1134.1 -
63 27 1297-Apr-0901:24:29 491 22 -8692 P -a 0.8611 1.2808 0.2753285.2116.3 -
64 28 1315-Apr-2008:48:57 455 20 -8469 P -a 0.9245 1.1648 0.1585276.5 90.0 -
65 29 1333-Apr-3016:06:07 422 20 -8246 P -a 0.9930 1.0398 0.0323265.8 41.5 -
66 30 1351-May-1123:14:18 392 20 -8023 N -h 1.0676 0.9037-0.1053252.3 - -
67 31 1369-May-2206:17:42 362 20 -7800 N -h 1.1449 0.7629-0.2482236.1 - -
68 32 1387-Jun-0213:14:52 335 20 -7577 N -h 1.2258 0.6158-0.3979216.1 - -
69 33 1405-Jun-1220:10:09 309 20 -7354 N -h 1.3072 0.4679-0.5488191.9 - -
70 34 1423-Jun-2403:00:23 285 20 -7131 N -h 1.3913 0.3154-0.7049160.5 - -
71 35 1441-Jul-0409:52:10 262 20 -6908 N -t 1.4728 0.1680-0.8564119.2 - -
72 36 1459-Jul-1516:42:40 240 20 -6685 Ne -t 1.5537 0.0218-1.0072 43.7 - -

Statistics for Lunar Eclipses of Saros 91

Lunar eclipses of Saros 91 all occur at the Moon’s descending node and the Moon moves northward with each eclipse. The series will begin with a penumbral eclipse near the southern edge of the penumbra on 0179 Jun 07. The series will end with a penumbral eclipse near the northern edge of the penumbra on 1459 Jul 15. The total duration of Saros series 91 is 1280.14 years.

Summary of Saros 91
First Eclipse 0179 Jun 07
Last Eclipse 1459 Jul 15
Series Duration 1280.14 Years
No. of Eclipses 72
Sequence 7N 22P 15T 21P 7N

Saros 91 is composed of 72 lunar eclipses as follows:

Lunar Eclipses of Saros 91
Eclipse Type Symbol Number Percent
All Eclipses - 72100.0%
PenumbralN 14 19.4%
PartialP 43 59.7%
TotalT 15 20.8%

The 72 lunar eclipses of Saros 91 occur in the order of 7N 22P 15T 21P 7N which corresponds to the following.

Sequence Order of Lunar Eclipses in Saros 91
Eclipse Type Symbol Number
Penumbral N 7
Partial P 22
Total T 15
Partial P 21
Penumbral N 7

The longest and shortest eclipses of Saros 91 as well as largest and smallest partial eclipses appear below.

Extreme Durations and Magnitudes of Lunar Eclipses of Saros 91
Extrema Type Date Duration Magnitude
Longest Total Lunar Eclipse 0810 Jun 2001h39m23s -
Shortest Total Lunar Eclipse 0954 Sep 1500h32m10s -
Longest Partial Lunar Eclipse 0972 Sep 2503h07m20s -
Shortest Partial Lunar Eclipse 1333 Apr 3000h41m30s -
Longest Penumbral Lunar Eclipse 1351 May 1104h12m19s -
Shortest Penumbral Lunar Eclipse 1459 Jul 1500h43m41s -
Largest Partial Lunar Eclipse 0972 Sep 25 - 0.98084
Smallest Partial Lunar Eclipse 1333 Apr 30 - 0.03230

Links to Additional Lunar Eclipse Predictions

Calendar

The Gregorian calendar (also called the Western calendar) is internationally the most widely used civil calendar. It is named for Pope Gregory XIII, who introduced it in 1582. On this website, the Gregorian calendar is used for all calendar dates from 1582 Oct 15 onwards. Before that date, the Julian calendar is used. For more information on this topic, see Calendar Dates.

The Julian calendar does not include the year 0. Thus the year 1 BCE is followed by the year 1 CE (See: BCE/CE Dating Conventions). This is awkward for arithmetic calculations. Years in this catalog are numbered astronomically and include the year 0. Historians should note there is a difference of one year between astronomical dates and BCE dates. Thus, the astronomical year 0 corresponds to 1 BCE, and astronomical year -1 corresponds to 2 BCE, etc..

Eclipse Predictions

The eclipse predictions presented here were generated using the JPL DE406 solar and lunar ephemerides. The lunar coordinates have been calculated with respect to the Moon's Center of Mass.

The largest uncertainty in the eclipse predictions is caused by fluctuations in Earth's rotation due primarily to tidal friction of the Moon. The resultant drift in apparent clock time is expressed as ΔT and is determined as follows:

  1. pre-1950's: ΔT calculated from empirical fits to historical records derived by Morrison and Stephenson (2004)
  2. 1955-present: ΔT obtained from published observations
  3. future: ΔT is extrapolated from current values weighted by the long term trend from tidal effects

A series of polynomial expressions have been derived to simplify the evaluation of ΔT for any time from -2999 to +3000. The uncertainty in ΔT over this period can be estimated from scatter in the measurements.

Acknowledgments

Some of the content on this web site is based on the books Five Millennium Canon of Lunar Eclipses: -1999 to +3000 and Thousand Year Canon of Lunar Eclipses 1501 to 2500. All eclipse calculations are by Fred Espenak, and he assumes full responsibility for their accuracy.

Permission is granted to reproduce eclipse data when accompanied by a link to this page and an acknowledgment:

"Eclipse Predictions by Fred Espenak, www.EclipseWise.com"

The use of diagrams and maps is permitted provided that they are NOT altered (except for re-sizing) and the embedded credit line is NOT removed or covered.