Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 6 · Calendar, Muhurta Elements
कालमानं मुहूर्ताङ्गानि च
दिवामुहूर्ता रुद्राहिमित्रपितृवसूदकम् ।विश्वेविधातृब्रह्मेंद्ररुद्राग्निवसुतोयपाः ॥ २२४ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 224.
The day muhurtas (48 minutes) are Rudra, Ahi, Mitra, Pitri (ancestors), Vasu and Udaka. Then Vishve, Vidhatri, Brahma, Indra, Rudra, Agni, Vasu and Toyapa.
Simple meaning: The fifteen parts of the day each have a god as lord. The list starts here.
अर्यमा भगसंज्ञश्च विज्ञेया दश पंच च ।
The fifteen day muhurtas end with Aryama and Bhaga. A second list of fifteen then begins.
धातृ इन्द्रादितीज्याख्या विष्णवर्कत्वष्टृवायवः ।
Each muhurta is a fifteenth part of the day, and a fifteenth part of the night.
मुहूर्तमानं द्वरावक्षणर्क्षाणि समेश्वरम् ।
A muhurta is one fifteenth of day or night. The bad muhurtas for each weekday begin here.