> First, who is Peter referring to in (2 Peter 1:19) in the KJV when Peter refers to the “Day Star”?

Given what 2 Peter is about, it is likely an allusion to the second coming of Christ. But that can't explain Peter's full meaning, since he says this star "rises in your hearts." therefore it probably means the full revelation of Christ, both now and continuing through life as we await His second coming. He is speaking of personal experience. When people accept Christ, they accept Him into their hearts. His presence saves (James 1.21), so that the dark place, which is the human heart, is transformed into light when Christ, like the morning star (the planet Venus), rises to the new day—rises to the new life.

> Isaiah 14.12

Isaiah 14 is a condemnation of the king of Babylon. While it was traditionally interpreted as talking about Satan, most scholars now reject that interpretation. "The morning star" (planet Venus) is used as a literary image for the once glorious king who will be brought down low because of his pride and irresponsibility.

I am a relatively new Christian and I am having trouble discerning what the terms “Day Star” and “Morning Star” refer to.

First, who is Peter referring to in (2 Peter 1:19) in the KJV when Peter refers to the “Day Star”?

The ESV uses “morning star” (2 Peter 1:19 ESV) in place of “Day Star”.

Second, in the KJV, Isaiah refers to the fall of Lucifer: “How art thou fallen from heaven, O Lucifer, son of the morning.” (Isaiah 14:12 KJV)

In the ESV, Isiah says “How you are fallen from heaven, O Day Star, son of Dawn.” (Isaiah 14:12 ESV)

When I researched “Day Star”, Bible Study Tools informed me that “Day Star” and “Morning Star” are other names for Lucifer.

The biggest questions I have : Who is Peter referring to in 2 Peter 1:19?

Day Star and Morning Star cannot refer to both Lucifer and God, as that would be blasphemy (obviously).

If Peter is referring to Jesus when he uses the term “Day Star” in 2 Peter 1:19 in the KJV, then why does the ESV (Isaiah 14:12) state, “How you are fallen from heaven, O Day Star, son of Dawn?

Thank you for your help and God bless!