Gabriel-3

Very nice collection. Thanks for sharing.

Fascinating collection of photos from the '60s found on youtube
 

The above, from near the end of my last post should have started out, "From the time of the first Watchtower in 1879 until 1929, the only possible exceptions  . . . . "  (The other possible exceptions from 1929 until now had already been mentioned just above that.)
Just one more point to add is the fact that either method "Passover" or "Easter/Memorial" is consistent enough that you can always get the right date (within a day) by remembering that both methods "align" again every 19 years (Due to those 7 intercalary leap-months added every 19 years.) It's really amazing just how closely lunar 19 "lunar years" made up of 19 time 12 lunar months + 7 extra lunar months is almost exactly the same as 19 solar years.
You can check this by taking any year that we have had the memorial and dividing it by 19. If it divides evenly and the remainder is zero, then you can test every one of those years with the zero remainder and we will have the Memorial on that same day for each of those years. In fact it works for every possible remainder after dividing the year by 19.
For example, 2016 divided by 19 will have a remainder of 2. 19 years prior to that (1997 / 19) also has a remainder of 2, as does 1978 divided by 19, etc, etc. Look at the Memorial dates as announced in the Watchtower for each of these years:
1940: 3/23
1959 3/23
1978 3/23
1997 3/23
2016 3/23
You can almost always tell exactly what day the Memorial will be on by looking at what day it was on 19 years ago.