For followers of astrology, a Jupiter cycle ended on May 26, 1939. This blogger does not understand it and could not fathom from the link below or other online sources what it means.
Image and text scan from https://www.light.org/CyclesofJupiter-SL145.cfm .
A website claims to show the astrological details about the adopted daughter of actress Joan Crawford, Christina Crawford, who was born in 1939 in Los Angeles: http://www.astro.com/astro-databank/Crawford,_Christina . Perhaps someone skilled in the belief could compare the information in the charts to facts about her life. She was the author of several books including Mommie Dearest.
Arguments against belief in astrology can be found here: http://www.humantruth.info/astrology.html . It describes a prediction for 1939.