The Vaisnava Calendar Program - Version 4.01 VCAL calculates Vedic lunar calendars. There are different ways to make calendars according to the Vedic lunar system, all very similar. This program makes the calendar according to the Gaudiya Vaisnava tradition, an important branch of the Vaisnava tradition. The word "Vaisnava" denotes a worshiper of Visnu. VCAL has been developed for ISKCON, the International Society for Krishna Consciousness, which follows the Gaudiya Vaisnava tradition. But the calendars VCAL produces should be useful for most people who follow a Vedic lunar calendar. VCAL was written by Syamasundara Dasa. He and Markandeya Rsi Dasa developed it further. To develop the program, in June 1989 Markandeya went to India for extensive research and consultation with persons knowledgeable about calendar making, astronomy, and Vaisnava observances. The learning and expertise of those consulted have contributed greatly to the reliability of this program.