Kalpa (कल्प) is a Sanskrit word meaning ‘aeon’ or ‘age’. It’s the Hindu unit of time to measure very long time periods, especially the ages of the gods and goddesses. One Kalpa is the one day (12 hours, as we say) of Lord Brahma and it equals to 1008 maha-yugas. In Hinduism measures, one Kalpa equals 4.32 billion years. It’s said that it is the 51st year of Lord Brahma and more than 36500 Kalpas were spent before Brahma created the current universe. It’s been not more than two Kalpas since the current universe had its genesis.