He explains that just like there are 365 sinews and 248 limbs in the soul (nefesh), there are similarly 365 sinews and 248 limbs in the complete level of both the world (olam) and the year (shanah).
He goes on to explain that the 365 days represent the 365 sinews of the year, and the year analog to the soul's gid hanasheh (sciatic nerve -afaik) is the 9th of Av. The gid haNasheh is the source of the power of the 'other side' in the level of soul. The 9th of the month of Av plays a similar role in the level of the year. The 9th of Av is the day when the 'other side' is at its most influential, hence the destruction of both temples and the sin of the golden calf(?) happened on that day.
When it says that the Angel strove with Yaakov until the rising of the sun, he teaches that the Satan will strive with Bnei Yisrael until the coming of the mashiach at which time, the 'other side' will be annihilated. Until then, he used his expanded influence over the gid haNasheh/Tisha B'av to wound us.
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