During his revelation John twice attempts to worship an angel; each time they correct him:

⁹ And the angel said to me, “Write this: Blessed are those who are invited to the marriage supper of the Lamb.” And he said to me, “These are the true words of God.” ¹⁰ Then I fell down at his feet to worship him, but he said to me, “You must not do that! I am a fellow servant with you and your brothers who hold to the testimony of Jesus. Worship God.” For the testimony of Jesus is the spirit of prophecy. (Revelation 19:10) [ESV]

⁸ I, John, am the one who heard and saw these things. And when I heard and saw them, I fell down to worship at the feet of the angel who showed them to me, ⁹ but he said to me, “You must not do that! I am a fellow servant with you and your brothers the prophets, and with those who keep the words of this book. Worship God.” (Revelation 22)

First, many attempt to refute the numerous passages where Jesus is worshipped by claiming the action (προσκυνέω) was obeisance. But as John shows, the two actions are separate: ἔπεσον ἔμπροσθεν τῶν ποδῶν αὐτοῦ προσκυνῆσαι I fell at his feet to worship.

Second, the angels explain to John only God is to be worshipped. Therefore the reason angels are commanded to worship the Son is He is God and must be worshipped as such.

During his revelation John twice attempts to worship an angel; each time they correct him:

⁹ And the angel said to me, “Write this: Blessed are those who are invited to the marriage supper of the Lamb.” And he said to me, “These are the true words of God.” ¹⁰ Then I fell down at his feet to worship him, but he said to me, “You must not do that! I am a fellow servant with you and your brothers who hold to the testimony of Jesus. Worship God.” For the testimony of Jesus is the spirit of prophecy. (Revelation 19:10) [ESV]

⁸ I, John, am the one who heard and saw these things. And when I heard and saw them, I fell down to worship at the feet of the angel who showed them to me, ⁹ but he said to me, “You must not do that! I am a fellow servant with you and your brothers the prophets, and with those who keep the words of this book. Worship God.” (Revelation 22)

First, many attempt to refute the numerous passages where Jesus is worshipped by claiming the action (προσκυνέω) was obeisance. But as John shows, the two actions are separate: ἔπεσον ἔμπροσθεν τῶν ποδῶν αὐτοῦ προσκυνῆσαι I fell at his feet to worship.

Second, the angels explain to John only God is to be worshipped. Therefore the reason angels are commanded to worship the Son is He is God and must be worshipped as such. The Son is in every way equal to God except He took on human form in order to die and bring salvation to mankind and to free creation from bondage.