In this subsection we will discuss the verification process applied to the final solution for the Small Esna zodiac, which was May 6-8, 1404. We will compare the real astronomical pictures occuring on these dates with the situation shown on the Small zodiac. In particular, we are interested in the presence of the visibility attributes and the information included in the partial horoscopes. On Figure 7.44, we show the complete check-up list for the final solution. Let us recall that we call a
solution complete or full, if we are able to confirm the full agreement between the solution and all the astronomical information decoded from the zodiac. On Figure 7.44, we used the sign plus to confirm good correspondence between the solution and the specific items from the check-up list (see section 6.14).
In regards to the visibility of planets, we need to make verifications only for Mercury, Venus and Mars. Only those planets could turned out to be invisible because of their proximity to the Sun. The visibility attributes were not sometimes even marked on the Egyptian zodiacs for those planets which were located far away from the Sun.
Column 1: VISIBILITY OF PLANETS. Let us discuss first the visibility of Venus. According to its representation on the Small zodiac, Venus should be visible on the main date, and indeed, it was located in very good position from the evening visibility point of view. At the moment, when Venus was disappearing behind the horizon on May 7, 1404, the submersion of the Sun was SUH= 20o, i.e. Venus was descending already in a complete darkness. In addition, the brightness of Venus was also very high M = -3.5. Regarding the visibility of Mercury, its attributes on the Small zodiac indicate that it shouldn't be visible on May 7, 1404. On that day, Mercury raised in Cairo when the submersion of the Sun was only SUH= 2o, and its brightness was also very low — only M = +3.6, which can be compared with the brightness of faint stars. It is clear, that in such situation Mercury could not be visible neither in Cairo nor Luxor. The Mars attributes on the Small zodiac indicate that it was visible. This fact can also be confirmed in the case of our solution. On the main date, Mars was located in Gemini, not far from Venus — only 10o. Its brightness was rather high M = +1.8, which can be compared with the brightness of the second magnitude stars. In the evening on May 7, 1404, at the moment Mars descended on the horizon, the submersion of the Sun was SUH = 30o, which simply means that it was already night. Therefore, Mars was clearly visible at that time. Thus, we obtain that the visibility information included on the Small zodiac is confirmed by our solution, and consequently we annotate the first column with the plus sign to show that these conditions are satisfied.
Column 2: PARTIAL HOROSCOPE OF THE AUTUMN EQUINOX. As in the case of other zodiacs, we consider the variant of the year beginning in September, i.e. the year of our solution started in September 1403 and ended in August 1404. The exact date of the autumn equinox in that year was on September 10, 1403. Since even during the Middle Ages the computations of the exact autumn equinox date were not at all accurate, we should admit a possibility for an error of 5-6 days. Let us indicate the positions of the planets on the ecliptic on September 10, 1403 (see Table 7.17).
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