It has in the calculation and accounting a value of one full letter; and for this reason it is not often used in the calculation of letters; and if it is used, its numerical indication is understood, it is calculated by the value of one full letter, i.e., by the value of (0.1); because its position in the calculation is secondary, like its secondary position in writing; and the explanation of these types of numerical miracles with their examples in the Book of God Almighty has another place, God Almighty willing.

But what is the relationship of the numbers of the letters of this verse (13) to the wisdom of choosing the number nineteen (19)?!

To answer this question, we must begin with an important مقدمة (introduction) that all humans can understand: Astronomers have divided the moon into four important cycles: 1. The sidereal orbital period; it takes approximately (27.322) days; i.e., approximately 27 days and 7 hours.

2. The synodic monthly period; it takes approximately (29.5) days; i.e., approximately 29 days and 12 hours.

3. The Metonic eclipse period; it takes (19) solar years; equivalent to approximately (19.583) lunar years; i.e., 19 years and 7 months.

4. The Great Cycle; it takes 12 Metonic cycles; i.e., 228 = 12 × 19 solar years; equivalent to 235 lunar years; i.e., 228 years + 7 years.

From this information about the different types of lunar cycles, we notice that: 1. There is a clear relationship between the number nineteen (19) and the moon's orbit.

2. There is another clear relationship between the number nineteen (19) and the moon's orbit on one hand, and the number seven (7) on the other hand.

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