From what was brought down by his students, it appears that the GR"A understood by a similar calculation that the end of the third quarter of the sixth millenium would be the end spoken of in Daniel 9. This is the secret of תספרו לדור אחרון (count to the last generation, Tehilim 48:14), and of ארבעים שנה אקוט בדור (forty years I quarrel with a generation, Tehilim 95:10).
This refers to the return of the spiritual inclinations of the generation of the Midbar. This return started in 5751 (תספרו לדור, count TO the generation). I submit that the three major national sins of the generation of the Midbar have since been repeated. The worship of the late Lubavitcher Rebbe is a repetition of Chet HaEgel. Despising the Land of Israel, culminating in the expulsion of Jews from the Gaza strip, is a repetition of Chet HaMeraglim. The personal corruption of the elite is a return to the rebellion of Korach.
The GR"A taught that there would be 7 Pekidot of 36 years in the third quarter of the sixth millenium. This is the secret of עת הזמיר הגיע (the time of the song has arrived, Shir HaShirim 2:12). The historical realization of these Pekidot is less than clear to me. I humbly suggest that they are to be actualized in the third quarter of the sixth day as I have defined it. This would mean that the first Pekida started in 5729. With every Pekida lasting about 28.5 years, the beginning of the next, third, Pekida would be in the year 5786.
This would be in accordance with Zohar VaYera 119a, which addresses the process of the redemption and the Pekida that heralds its beginning, and states that this Pekida will be at the time of a count reaching 60. This count then, whould be the count of Chochma, which reached 60 in the year 5729.
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