Indian Chronology (Solar, Lunar and Planetary): A Practical Guide to the Interpretation and Verification of Tithis, Nakshatras, Horoscopes and other Indian Time-records, B.C. 1 to A.D. 2000 c32.9

Dividing 27 by 7, we have as remainder 6, which is equivalent to Friday, the 6th day of the week.