What is the collective noun for constellations?

There isn't a widely accepted or commonly used collective noun specifically for constellations.

However, you could use some descriptive terms to describe a group of constellations, such as:

* A tapestry of constellations

* A celestial array

* A sky full of constellations

* A constellation cluster

* A collection of constellations

You could also use more poetic terms like:

* A celestial symphony

* A cosmic canvas

* A starlit panorama

Ultimately, the best collective noun to use would depend on the context and the desired effect.