Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 6 · Calendar, Muhurta Elements
कालमानं मुहूर्ताङ्गानि च
योगाः स्वसंज्ञाफलदा अष्टाविंशतिरीरिताः ।रविवारे क्रमादेव दस्रभादिंदुभाद्विधौ ॥ २४० ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 240.
These twenty-eight yogas (good or bad day mix) are said to give results like their names. On Sunday, count in order from Ashvini. On Monday, from Mrigashira.
Simple meaning: The 28 day mixes give results like their names. Sunday starts at Ashvini, Monday at Mrigashira.
सापार्द्धौमे बुधे हस्तान्मैत्रभात्सुरमंत्रिणि ।
The count starts at a different star each weekday: Ashlesha, Hasta, Anuradha, Uttara Ashadha and Shatabhisha.
हस्तर्क्षं च खाविंदौ चंद्रभं दस्रभं कुजे ।
Siddhi yoga: Hasta on Sunday, Mrigashira on Monday, Ashvini on Tuesday, Anuradha on Wednesday, Pushya on Thursday, Revati on Friday.
रोहिणी मंदवारे च सिद्धियोगाह्वया अमी ।
Rohini on Saturday completes the Siddhi days. Nanda and Bhadra fall on certain weekdays.