Yaegiku no niou ni shirushi kimi ga yo wa chitose no aki o kasanu beshi to wa - Senzai Wakashu(English Translation & Meaning)

八重菊の匂ふにしるし君が代は
千歳の秋を重ぬべしとは

Roma-ji: Yaegiku no niou ni shirushi kimi ga yo wa chitose no aki o kasanu beshi to wa
English Translation: In the radiance
of the double chrysanthemums
it is clear to see:
that my lord's reign shall layer
a thousand autumns upon it
Meaning: It is plain to see in the radiant bloom of the double chrysanthemums: my lord's reign is sure to layer a thousand autumns upon itself.
Commentary: Book Ten Poems of Celebration 620

Headnote continued from the preceding poem: "Composed when, on the occasion of an imperial visit to the Hōkongōin in the second year of Hōen, he had poems composed on the topic 'Chrysanthemums Pledge Many Autumns'"
Composed on the same imperial visit as the preceding poem. It is plain in the radiant bloom of the double chrysanthemums, he says, that my lord's reign will layer a thousand autumns. In the form of the double chrysanthemum layering its petals, he sees a sign that the reign will layer autumn upon autumn. The "many autumns" of the topic become "a thousand autumns." The second line in the text reads "niou ni shirushi," which does not match "nioi ni shirushi" in the line of kana readings; the text is followed here.
The author, "the Hanazono Minister of the Left," is Minamoto no Arihito. A grandson of Emperor Go-Sanjō and son of Prince Sukehito, he was made a commoner with the surname Minamoto and rose to Minister of the Left. He excelled in poetry and music.
This is the second poem in the sequence. As if taking up 619, which called the white chrysanthemum a "sign" of a thousand years, this poem says that a thousand autumns are "plain to see" in the radiance of the double chrysanthemum.

First line, "yaegiku no": "of the double chrysanthemums," with layer upon layer of petals. "Yae," "eightfold," is a related word to "kasanu," "to layer," in the last line.
Second line, "niou ni shirushi": "niou" means to bloom in radiant color, and "shirushi" here is an adjective, "clearly evident." The poem pauses here and stands in inverted order with the lines that follow. It answers "shirushi naruran" in the last line of the preceding poem.
Third line, "kimi ga yo wa": "my lord's reign."
Fourth line, "chitose no aki o": "a thousand autumns," taking up "many autumns" in the topic.
Fifth line, "kasanu beshi to wa": "beshi" is conjectural, "that it will surely layer." Breaking off with "to wa," the line turns back by inversion to "shirushi" in the second line.
Author: Minamoto no Arihito
Source: Senzai Wakashu
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