Lunar art refers to the period of decay and growth of the moon visible from the earth. Chandrakala has been divided into sixteen parts. Different illuminated parts of the moon can be seen at different times. The white moon grows little by little every day and completes its sixteenth century. These sixteen kinds of lunar arts are Amrita , Manda , Pusha , Tusti , Pushti , Rati , Dhriti , Shashini , Chandrika , Kanti , Jyotsna , Sri , Preeti , Akshada , Purna and Purnamrita. According to Indian astronomers, the Moon takes a total of 26 days to cross 12 constellations and 26 constellations. This time is called lunar month. In other cases 1 lunar month is considered from one full moon to the day before the other full moon. Each lunar month is divided into 30 parts. Each of these 30 parts is called a date. Inside, the part consisting of 15 dates from the next date of the new moon to the full moon is called Shuklapaksh. On the other hand, the part consisting of 15 dates from the date after the full moon to the new moon is called Krishnapaksha. The dates are slightly shorter than the solar days. So the lunar month is a little shorter than the solar month. There is one lunar month in about 29 and a half solar days. This form is made up of 12 lunar months and 1 lunar year. The solar year is generally calculated as 365 days. On the other hand lunar year is 355 days. As a result, there is a difference of 10 days of solar year with each lunar year. In three years the difference is 30 days. For this reason, in the Vedic age of India, the solar year was combined with the lunar year by adding an additional month every three years. This extra month is called Malimluch or Malmas. After the new moon, this illuminated part of the moon continues to grow and attains perfection in the full moon. Again from the full moon the illuminated part of the moon decreases and reaches the new moon. One of the chapters of the rising and falling of this illuminated part of the moon is called Kala or Chandrakala. Wikipedia