In a sphere with a 300 foot radius, you cast an illusion across the sky. Astronomical bodies may appear, disappear, or move. The color of the sky can change. While the illusion does have an effect on light, magical items do not regain charges if the sky seems to be at dawn. A successful Intelligence saving throw does reveal that it is an illusion and disperses effects on light. 

If you cast this spell using 1 action, the duration is 1 hour.

If you cast this spell as a ritual, the duration is 8 hours.