You cast an illusion across the sky itself. For the duration, you can produce the following effects within range:
Malleable Firmament. As a bonus action, you change various aspects like the color of the sky, lighting, cloud cover, phase(s) of the moon, and/or the positions, presence, or absence of heavenly bodies. Attempts to navigate using the sky as guidance are made at advantage for any creatures you choose within the spell's area. You can also can cause creatures you choose to have disadvantage on checks to navigate using the sky within the spell's area; if a creature becomes lost while suffering disadvantage this way, you choose the direction it travels for the first mile after becoming lost. You don't need to see a creature or know its location to target it with this effect.
Phantasmagoria. As an action, you cause the sky in a 100-foot-radius area you choose within range to quickly change between night, day, and a series of other appearances you choose. Each creature within that area must make a Wisdom saving throw or be incapacitated for 1 minute. An affected creature can repeat its saving throw at the end of each of its turns, ending the effect on a success; once a creature is no longer incapacitated by this spell, it is immune to this effect for 24 hours.
True Sky. As an action, you change the sky to a condition such as dusk, midday, a new moon, or an eclipse. The illusion is so realistic that it triggers effects or properties within the spell's area that would activate at a certain time of day or at during a certain celestial event (such as a magic item regaining charges at dawn, or a werewolf transforming on the night of the full moon). You can't use this effect again until you cast cosmic canvas again.
While the caster concentrates on it, this spell can't end by any means short of a wish. Including the caster in the area of an antimagic field will suspend the effect.