In the 36th message of the book of Zechariah we see descriptions of the massive changes in natural phenomena of the earth as the Millennial Kingdom of our Lord is established on earth. This is exactly what the Lord Jesus told His apostles and us to pray for when He said, “Thy kingdom come, Thy will be done on earth as it is in Heaven” (Matthew 6:10). Our text here describes the general age of the Day of the Lord which here is characterized as “That Day.” This description encompasses the entire period from the beginning of the Tribulation on through the establishment and extent of the Messianic Kingdom and Eternal Order. In short it is when God takes His earth back from the evil forces, which have influenced it for at least six thousand years. As the Tribulation ends, the Lord Jesus returns, and the seventy-five day interval ends a spectacular series of events occurs in the heavens. All natural light from the sun, the moon and the stars cease to give their light for a time. This has happened before when God was doing some miraculous activity associated with His massive changes in the order of the earth.