In Ramayana, Jatayu at the time of his death stated the following
"In which spell of time Ravana has gone taking away Seetha, that spell is named as Vinda... if any riches are lost during that spell, the original possessor of those riches will repossess them very quickly... oh, Kakutstha, he that Ravana is unmindful of that fact and stole Seetha only to loose her... [3-68-12, 13a]
The link further mentions that there are 15 spells of time at daytime and they have their own effects on humans.And Vinda also known as Vijaya is the 11th spell. Any action initiated in this spell of the day entails adverse effects, in so far as that aim and action of the initiator.
So which period in day time does the period Vinda correspond to? Does it change during the course of the year ?