Continuing on the calculations...

When one knows, for a specific date, the duration of the unequal hours of the day and night , it is easy to, from the sun rise , calculate the beginning and the end of the period reigned by  (in this case Samael or Anael).

For example:
Friday 8th of May 2001, knowing that the sun rose at 4h 43m 36s (17015 s) and that each unequal hour of the day lasts for 1h 12m 34s (4354 s):

* the Ist hour of the day starts at 4h 43m 36s
and ends at: 4h 43m 35s + 1h 12m 34s=5h 56m 9s. 

*the VIIIst  hour of the day starts at:
17015 s+8 (4354)=51847 s, 14h 24m 7s
and ends at:
14h 24m 7s+1h 12m 34s=15h 36m 41s etc.