Margashira Masam is happens when (pornima ) Full Moon Day coincides with Mrigashira constellation. This month is also named after the star Mrigasira.
During the month Sun transits in Scorpio sign (Vrischika raasi) and will enter into Dhanus rashi in the middle of the month then it is known as Dhanurmasam. It marks the beginning of Hemantha Ruthu that generally occurs during the months of November and December.
Margashira masam is a highly commendable month to worship Lord Sri Vishnu, Goddess Sri Maha Lakshmi.
Several religious events also occur during the month of Margashira.
Sixth day of Margasira masam, sukla Shasti thithi is also known as Champa Shasti which celebrated as Malhari Martand Janmostav in Maharashtra, Karnataka. This god is commonly known as Khandoba (incarnation of Lord Shiva) in Maharashtra.
During Dhanurmasam the Mokshada Ekadasi day is most auspicious to worship Lord Sri Maha Vishnu. It is also popular as a Vaikunta Ekadasi or Mukkoti Ekadasi.
The arrangement of Uttara Dwara darshanam of Lord Vishnu is associated with Ekadasi thithi, has also significant as of Vaikunta Ekadasi.
This day most auspicious day to worship Lord Sri ManNarayana along with Goddess Sri Maha Lakshmi and also to have Uttara Dwara darshana of the Lord on this day.
Special celebrations are held at Tirumala, where thousands of devotees visit the temples to have the Uttara Dwara darshanam of the Lord Venkateswra.
Sri Dattatreya Jayanthi is celebrated on full Moon day in Margashira masam the day on which Lord Dattatreya regarded as an incarnation of Trinity Lords (Brahma, Vishnu & Maheshwara) was born.
As per Sri Venkatachala Mahatmya it is said that, taking bath in Sri Swami Pushkarini Theertha at Tirumala on the day of Sukla Dwadasi in the month of Dhanurmasam during Arunodaya time is considered as highly holy and celestial.
Taking bath on this day in Swami Pushkarini is considered highly meritorious and equivalent to taking bath in all the three crores of sacred theerthas.
Geeta Jayanthi the day on which Lord Sri Krishna counseled Arjuna with his eminent preaching known as Bhagawadgeeta falls in Margashirsha month on the day of sukla paksha Ekadasi.
It benefits to read at least one Adhaya of Bhagawadgeeta on this sacred day duly understanding its meaning.
This year Margashira masam begins on 03rd December, 2013 and ends on 01st January, 2014. Amavasyant calenders fallowed in Andhra Pradesh, Goa, Maharashtra, Gujarat and Karnataka.