When four or more planets form two sets of oppositions that combine to form four squares, there is a grand cross or grand square. These planets are also usually related by mode (Cardinal, Fixed, or Mutable). This is a difficult configuration, and may produce more frustration than the T-square, but there is usually great strength accompanying it to endure and develop character.
Readers, please enjoy this guest blog post by Sandra Kynes, author of several books, including The Herb Gardener's Essential Guide, Plant Magic, and the new Witches' Encyclopedia of Magical Plants, among many others.
Although a few old books...