ISB ~ 2 Peter 1 v19

the day dawns:The eschatological “day of the Lord”. For its meaning, see note on 2 Pet 3:10. morning star: Ancient writers used this expression for the planet Venus, which is sometimes visible in the morning sky just before daybreak.

• In addition, the expression is probably an allusion to Num 24:17, where the star that rises out of Jacob is seen in Jewish and Christian tradition as a prophetic image of the Messiah (Rev 22:16). Peter connects this with the return of Christ in glory, an event that will dawn upon the world at the end of history and bring joy to the heart of every believer who is eagerly awaiting him (Heb 9:28).