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Shifting Milestones of Natural Sciences: The Ancient Egyptian Discovery of Algol's Period Confirmed

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Abstract

The Ancient Egyptians wrote Calendars of Lucky and Unlucky Days that assigned astronomically influenced prognoses for each day of the year. The best preserved of these calendars is the Cairo Calendar (hereafter CC) dated to 1244–1163 B.C. We have presented evidence that the 2.85 days period in the lucky prognoses of CC is equal to that of the eclipsing binary Algol during this historical era. We wanted to find out the vocabulary that represents Algol in the mythological texts of CC. Here we show that Algol was represented as Horus and thus signified both divinity and kingship. The texts describing the actions of Horus are consistent with the course of events witnessed by any naked eye observer of Algol. These descriptions support our claim that CC is the oldest preserved historical document of the discovery of a variable star. The period of the Moon, 29.6 days, has also been discovered in CC. We show that the actions of Seth were connected to this period, which also strongly regulated the times described as lucky for Heaven and for Earth. Now, for the first time, periodicity is discovered in the descriptions of the days in CC. Unlike many previous attempts to uncover the reasoning behind the myths of individual days, we discover the actual rules in the appearance and behaviour of deities during the whole year.

Introduction

The Ancient Egyptians referred to celestial events indirectly [1, 2, 3, 4] by relating them to mythological events. Many prognoses in the Calendars of Lucky and Unlucky Days have been connected to astronomical observations [1, 5, 6, 7]. Such connections between astronomical events and prognosis texts have been uncovered in most cases only for individual days [6, 8, 9]. The PM=29.6P_{M} = 29.6 days period of the Moon has been discovered in CC [10]. We have claimed that this document also contains the PA=2.85P_{A} = 2.85 days period of the eclipsing binary Algol [11]. However, it not a straightforward task to identify those indirect mythological references that are influenced by Algol in CC. Here we present a statistical analysis that reveals which CC prognosis texts describe Algol’s regular variability.

The Ancient Egyptian year contained 12 months (MM) of 30 days (DD) and five additional “epagomenal” days. CC gives three prognoses for each DD of every MM (G = “gut” = “good” and S = “schlecht” = “bad”) [11, 12]. CC also gives textual descriptions of the daily prognoses (S1 Fig). We study the dates of 28 selected words (hereafter SWs) in these mythological texts of CC. The dates are transformed into series of time points tit_i with equation (2). The PAP_A and PMP_M signals were originally discovered [11] from six large samples of lucky prognoses (n=6×564=3384n = 6 \times564 = 3384). We use these six samples to determine the zero epochs tEt_E of equation (9) for the PAP_A and PMP_M signals. The time points leading to the discovery of these signals were close to phase, ϕ=0\phi= 0, of equation (5) using the ephemerides of equations (11) and (12) based on these zero epochs tEt_E. The lucky prognoses of each SW are a subsample of the above mentioned large samples of lucky prognoses. We compute an impact parameter zxz_x for the tit_i of each SW with equation (10). The time points tit_i of the lucky prognoses of any particular SW may strengthen (if zx>0z_x > 0) or weaken (if zx<0z_x < 0) the PAP_A and PMP_M signals. The impact parameter zxz_x is used for identifying the SWs having lucky prognoses close to phase, ϕ=0\phi= 0, computed with the ephemerides of equations (11) and (12). We will show that Algol and the Moon were at their brightest close to phase ϕ=0\phi= 0 with these two ephemerides. Hence, Algol’s eclipse and the New Moon occurred close to ϕ=0.5\phi= 0.5.

Our statistical analysis also confirms two general things regarding the origin of the mythological texts of CC. First, the appearances and feasts of various deities are not independent of the prognoses, or randomly assigned, but regulated by the same periodic patterns. Second, the deities are used to represent the same astronomical phenomena that were also used to choose the prognoses for the days of the year.

Materials

In this section, we transform the dates of 28 SWs in the mythological texts of CC into series of time points tit_i. Our main aim is that all stages of the production of these data can be replicated. With these instructions, similar series of time points can be produced for any particular SW in CC or other similar calendars, where the SW dates are available. We create the data in two stages: Identification of SW dates and Transformation of SW dates into series of time points.

Identification of SW dates

CC is the best preserved Calendar of Lucky and unlucky Days. As in our two previous studies [10, 11], we use the best preserved continuous calendar found on pages recto III-XXX and verso I-IX of papyrus Cairo 86637. There are two CC translations, in English by Bakir [13] and in German by Leitz [12]. Our SWs have been identified according to the hieroglyphic transcription in Leitz [12] and the two aforementioned translations. In case of discrepancy we have consulted the photocopies of the original hieratic text given by Leitz [12]. For the sake of convenience, we quote sentences according to Bakir’s English translation despite its imperfections because there is neither space nor reason to discuss the linguistic details of the text in the present article. This approach should ascertain that our study of the CC sentences is objective. In other words, we do not ourself translate any CC sentences into English, but we do check which individual Ancient Egyptian SWs were also identified by Bakir [13] and Leitz [12]. There is only one exception to our sentence quotation rule, i.e. the CC text connected to Horus where Bakir [13] did not identify Horus, but Leitz [12] and we did (Algol in lucky prognoses: the text at date gi(1,10)g_i(1, 10)).

Naturally, we can not analyse all words in CC. Our main selection criterion is to include deities, nouns or locations that could have been used to indirectly describe periodic phenomena, due to their significant mythological properties and multiple occurrences in the text. Our list of SWs is not absolute and we give all the necessary information for other researchers to repeat our experiment on other SWs we may have ignored. Our 28 SWs in Ancient Egyptian language are given in Table 51.

ꜣḏwAbydosḥmMajesty
ḏdwBusirisrmtMan (mankind, men)
tꜣEarth (ground, land)nwtNut
ḫftyEnemynnwNun (primeval waters)
psḏtEnneadwnn-nfrOnnophris
ỉrtEyewsirOsiris
ḫtFirerꜥRe (the Sun)
nsrtFlamesbiRebel (to rebel)
ỉmyw-ḫtFollowers (following)šmꜥtSakhmet
ibHeartstẖSeth
ptHeaven (sky)šwShu (sunlight)
iwnwHeliopolissbkSobek
ḥrHorusḏḥwtyThoth
mꜣiLionwḏꜣtWedjat

Table 51. List of SWs in Ancient Egyptian language.

DMgig_iϕi\phi_iΘi\Theta_iΔΘi\Delta\Theta_in1n_1n2n_2QBQ_B
17246.330.07252110.1751
24383.330.05194280.4217
2510294.330.093283160.5496
15120.330.0413114190.4324
27386.330.1138155230.3766
245143.330.1138156240.2337
810277.330.1244217310.2934
21380.330.000238340.2350
911308.330.000239360.1664
10369.330.14512710370.0998
2512354.330.14512711400.0783
3232.330.16573412440.0716
21120.33-0.05-194213550.1543
198228.33-0.07-254814640.2209
6235.330.21765315670.1848
26151.33-0.09-325516720.1831
19118.330.25886517800.2275
1012339.33-0.12-446718880.2725
9238.330.26957219890.2053
211.330.281017820950.2164
9498.330.3211491211070.3194
29388.33-0.19-6993221100.2813
2412353.33-0.21-7699231160.2904
310272.330.37133109241200.2700
918.33-0.26-95118251270.2929
35122.33-0.26-95118261290.2460
134102.33-0.28-101124271370.2811
255144.330.46164141281470.3444
1490.33-0.49-177160291600.4516
10239.33-0.39-139162301630.4139
16150.33-0.44-158179311750.5032

Table 51.

DMgig_iϕi\phi_iΘi\Theta_iΔΘi\Delta\Theta_in1n_1n2n_2QBQ_B
215140.330.05193130.2333
15120.330.041392120.2705
2911328.330.026153250.3567
810277.330.1244234350.3447
19240.330.1451295410.2651
3232.330.1657356500.2472
21120.33-0.05-19407530.1591
69245.33-0.11-38598770.3277
168225.33-0.12-44669810.2468
1310282.33-0.12-446610820.1551
19118.330.25886711840.0976
310272.330.37133111121230.3491
910278.330.47171149131540.5476
10239.33-0.39-139160141600.4909
1490.33-0.49-177162151630.4088

Table 51.

DMgig_iϕi\phi_iΘi\Theta_iΔΘi\Delta\Theta_in1n_1n2n_2QBQ_B
26385.33-0.25-88181140.2739
97188.33-0.11-38322340.1789
198228.33-0.07-25453470.0900
10239.33-0.39-139694690.0711

Table 51.

DMgig_iϕi\phi_iΘi\Theta_iΔΘi\Delta\Theta_in1n_1n2n_2QBQ_B
2491.33-0.14-5110190.6401
295148.33-0.14-51102100.2924
26385.33-0.25-88283250.5119
26151.33-0.09-32294300.4046
6365.33-0.26-95345340.2989
110.33-0.07-25366380.2186
110270.33-0.33-120597670.5884
30259.33-0.37-133728760.5780
215140.330.0519809860.5835
1212341.33-0.42-1529110950.5750
17180.330.09329211990.4993
16150.33-0.44-15897121040.4413
27386.330.113899131080.3748
245143.330.113899141090.2794
285147.33-0.49-177116151250.3645
111300.330.1969130161370.4000
28387.330.46164135171400.3330
79246.330.2588149181530.3774
310272.330.37133167191700.4623

Table 51.

DMgig_iϕi\phi_iΘi\Theta_iΔΘi\Delta\Theta_in1n_1n2n_2QBQ_B
212331.330.0725151220.9178
1360.33-0.02-6162230.7236
17180.330.0932223290.6153
245143.330.1138284410.6547
198228.33-0.07-25355530.6854
10369.330.1451416560.5654
111300.330.1969597780.7449
2491.33-0.14-51618800.6372
6235.330.2176669830.5393
19118.330.25887810920.5328
2231.33-0.19-697911970.4713
26385.33-0.25-8898121150.5857
514.330.33120110131250.5907
134102.33-0.28-101111141280.5123
112330.33-0.28-101111151300.4244
310272.330.37133123161320.3425
18210.33-0.39-139149171530.4783
16150.33-0.44-158168181660.5188
158224.33-0.47-171179191750.5150

Table 51.

DMgig_iϕi\phi_iΘi\Theta_iΔΘi\Delta\Theta_in1n_1n2n_2QBQ_B
2212351.330.0932241280.3804
187197.330.0519372440.1711
28127.330.401459031000.2407

Table 51.

DMgig_iϕi\phi_iΘi\Theta_iΔΘi\Delta\Theta_in1n_1n2n_2QBQ_B
110.33-0.07-25131140.4316
127191.33-0.05-19192250.2599
19248.33-0.23-82443550.3715
17246.330.0725634730.3269
30259.33-0.37-1339551110.4484
305149.330.217611461210.3456
1490.33-0.49-17713971480.3696

Table 51.

DDMMgig_iϕi\phi_iΘi\Theta_iΔΘi\Delta\Theta_in1n_1n2n_2QBQ_B
1610285.33-0.07-252150.1335
65125.33-0.21-76492600.5083
45123.330.0932593730.3404
35122.33-0.26-95684880.2378
29258.330.2810112851340.3287

Table 51.

DMgig_iϕi\phi_iΘi\Theta_iΔΘi\Delta\Theta_in1n_1n2n_2QBQ_B
19118.330.2588331250.4353
298238.330.44158362310.1548
305149.330.2176463380.0542
78216.33-0.28-10113741290.3336

Table 51.

DMgig_iϕi\phi_iΘi\Theta_iΔΘi\Delta\Theta_in1n_1n2n_2QBQ_B
21380.330.0005160.0975
3010299.33-0.16-57622840.4176
165135.330.3010710231210.3372

Table 51.

We do not use the occurrences of our SWs in compound words and composite deities (e.g. House of Horus or Ra-Horakhti), because it is uncertain to which word, if not both, the prognosis is connected to. Our identifications of 28 SWs in CC are given in Table 52. It shows that all our 460 SW date identifications are the same as those made by Leitz [12] (Column 5: 460דYes”). However, 21 of our identifications were not made by Bakir [13] (Column 6: 21× “No”: 1× “Earth”, 2× “Enemy”, 4× “Fire”, 12× “Heart”, 1× “Horus” and 1× “Osiris”). Fortunately, most days have combinations “GGG” or “SSS” and we know that the lucky or unlucky SW prognosis is certainly correct. We ignore the heterogeneous combinations “HET” (like “SSG” at D=6D = 6 and M=1M = 1), because the correct SW prognosis is uncertain. The dates with an unknown prognosis combination, “- - -”, are naturally also ignored. Our notations for the number of lucky and unlucky dates for each SW are nGn_{\mathrm{G}} and nSn_{\mathrm{S}}. For example, “Abydos” has nG=3n_{\mathrm{G}} = 3 and nS=2n_{\mathrm{S}} = 2.

SWDDMMProgLtzBkr
Abydos133SSSYesYes
Abydos173- - -YesYes
Abydos114GGGYesYes
Abydos185GGGYesYes
Abydos276- - -YesYes
Abydos287GGGYesYes
Abydos138SSSYesYes
Abydos238- - -YesYes
Busiris262SSSYesYes
Busiris145SSSYesYes
Busiris265SSSYesYes

Table 52. SWs identified in CC.

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