The planet Neptune was in the sign of Libra from 1942 to 1957. It's important to note that Neptune takes about 164 years to make a complete cycle, spending about thirteen years in each sign, and therefore the interpretation applies to a generation rather than the individual. For a more individual interpretation you need to look at the house position of Neptune in your chart. Neptune in Libra indicates a generation with a romantic and idealised view towards partnership. The sign of Libra is concerned with relationships between people and what is right and just in each persons behaviour within a partnership. Neptune last passed through the sign of Libra beginning during the Second world War. During this period the realm of relationships took a dramatic change with the upheaval created by the war. There was an increased rate of divorce and less certainty in following the traditional institution of marriage at all costs. This was replaced by a generation more intent on following the spirit of a partnership.