Q&A: Nightfall
Nightfall
Question
It is well known what is discussed in Kovetz Shiurim on Pesachim regarding the definition of nightfall: whether the appearance of the stars is a sign of night or a cause of it.
I was not able to understand what it means to say that the stars are a cause of night. What is the connection by which they constitute night? After all, it is obvious that when darkness comes, that is night, and then the stars are seen. How can they be the cause of the legal status of night or of the reality of night? What is the explanation of this inquiry?
And if you have anything to add on the whole matter, we would be very glad.
With thanks and blessings.
Answer
Is night defined as the time when the stars are out, or is there some other definition, with the appearance of the stars serving only as a sign of it?
Discussion on Answer
It seems clear to me logically that light pollution should not make a difference here. I don’t know what the Chazon Ish said. I haven’t looked into these topics and I don’t have a position.
Why should night be defined as nighttime when the stars are visible outside? What is the connection between them?
This has a major practical implication nowadays because of light pollution (artificial light). Is the Rabbi following the Chazon Ish approach on this point?
Or how long after sunset is nightfall? (And at what angle?)