Panchangam is a Sanskrit term, which mean five parts (Panch + Angam). It is a Indian Astrological almanac which folow 5 parts of Vedic calender as 1- Tithi (Date), Nakshatra (Moon's constellation or star), Yoga, Karan Yoga, Sun rise and set time. You can see here Panchang for each month.
A Nakshatra or Constallation is 1/27th part of the Zodiac, identified by the prominent star(s) in them. Moon completes one rotation in approximately 27 days. So Moon's average one day moment in the Zodiac (130 20') is span of one Nakshatra.