Add day/night cycle

[NachoKai]

• Sunrise: The sun begins to rise and the sky gradually brightens. (5 min)
• Morning: The sun is fully up and the sky is clear. (5 min)
• Noon: The sun is at its highest point and the sky is clear. (5 min)
• Afternoon: The sun begins to set and the sky becomes darker. (5 min)
• Sunset: The sun is almost all the way down and the sky turns reddish or orange. (5 min)
• Night: The sun has set and the sky is dark. (5 min)