In the New Testament, Lord is the most frequently used title for Jesus Christ. Although we rarely use this term in our daily lives, we are all quite familiar with another word: boss. That is basically what Lord means—one possessing authority, power, and control.
When Venus rises, it means the sun will follow very soon. Christ's coming—and in a broad sense this could apply to both his first and his second coming—means/will mean God's light is about to shine forever on the universe.