| Spring Equinox: Moon's Milk or Under an Unquiet Skull | |
| Type: | EP |
| Artist: | Coil |
| Cover: | Coilspringequinox.jpg |
| Released: | 1998 |
| Genre: | Experimental, ambient, drone |
| Length: | 16:42 |
| Label: | Eskaton |
| Producer: | Coil |
| Prev Title: | Unnatural History III |
| Prev Year: | 1997 |
| Next Year: | 1998 |
Spring Equinox: Moon's Milk or Under an Unquiet Skull is part one of the four part Seasons collective created by Coil.
A first edition, released on spring equinox 1998, consisted of a limited 7" of 1000 copies on milky white vinyl and 55 copies on yellow vinyl and a CD-EP, which was deleted on summer solstice, when the second part was released. On the summer solstice of 2001 a second edition of the CD-EP was released, limited to 400 copies.
All four Solstice/Equinox releases have been compiled in a two-CD set entitled Moons Milk (In Four Phases). This CD will again be re-released on Moon's Milk In Six Phases.
Track 1 consists of mainly organ, whereas track 2 seems to use the same organ exactly with some added viola played by William Breeze.