Having seen the total solar eclipse in Zambia last month, I've gone on
a search for works about heavenly objects and events.  These are in my
library:

John Tavener: Total Eclipse
Harmonia Mundi 907271

Rued Langgaard: Music of the Spheres
Chandos 9517

Iannis Xenakis: Pleiades
BIS 482

Olivier Messiaen: Illuminations of the Beyond (The Constellation of
Sagittarius)
dg 439 929

Allan Hovhaness: Vision of a Starry Night
Koch 7288

Judith Weir: Airs from Another Planet
Lorelt 103

Anne Alice Le Baron: Solar Music
CHA 3023

Chen Yi: Pan Gu Creates Heaven and Earth
New Albion 090

Peter Sculthorpe: The Stars Turn
Vox Australis 018

Music about the polar Auroras (Borealis is the Northern Lights and
Australis, the Southern Lights):

Judith Zaimont: Sky Curtains
AR z6667

Eduard Tubin: Dance of the Northern Lights (from Kratt)
BIS 306

Lepo Sumera: Sym No 4, "Serena borealis"
BIS 690

Barry Conyngham: Southern Cross
Cala 1008

Susan