When Chaturdashi Tithi, or the fourteenth day, during the
fortnight falls on Tuesday it is known as Angarak Chaturdashi. The day is
highly meritorious for performing Yama Tarpanam and other rituals dedicated to
the departed souls.
Angarak Yog is associated with fiery Mangal.
Chaturdashi on Tuesday is even highly meritorious if it
happens during the Krishna Paksha or the waning phase of moon.