After his death in 1626, she married (in 1630) Elias von Löwen,[11] also from Silesia.[12] Elias von Lowen was also known as Elie de Loewen was a physician at Pitschen and studied astronomy.[3] Elias von Lowen was Maria's tutor[13] and encouraged Maria to pursue astronomy before their marriage in 1630.[3] Together they made observation of Venus on December 14, 1627 and Jupiter on April 1628.[3] Other areas of study included medicine, poetry, painting, music, mathematics, ancient languages, and history.[14] Elias and Maria had three sons: Elias Theodor, Anton Heinrich and Franz Ludwig.[3] During the Thirty Year's War from 1618 to 1648 Maria and Elias von Löwen[15] stayed in the Cistercians convent of Olobok, Poland.[3] While at the cloister in Poland, Cunitz expanded her astronomical tables to include all of the planets at any moment in time.[15] At the end of the Thirty Year's War the couple returned to their home at Pitschen in Silesia.[3] In 1650, Maria privately published of her own expense Urania propitia in German and Latin as a dedication to Emperor Ferdinand III.[3] Urania propitia was a simplification of Kepler's Rudolphine Tables due to their difficulty of producing calculations and applications, because the use of logarithms.[16] In the evening of May 25, 1656 in Pitschen, Silesia a large fire destroyed most of the homes in the city, including Maria's home, Maria lost astronomical instruments and Elias lost medical instruments.[3] The fire consumed Maria's books, letters, and more than 200 records of astronomical observations.[3] Maria became a widow again in 1661, and died at Pitzen on August 22, 1664.[11][17]