en_tn_lite_do_not_use/isa/48/13.md

my hand laid the foundation of the earth, and my right hand spread out the heavens

Here "hand" refers to Yahweh. AT: "I laid the foundation of the earth, and I spread out the heavens" (See: rc://en/ta/man/translate/figs-synecdoche)

the foundation of the earth

The word "foundation" normally refers to a stone structure that gives support to a building from underneath. Here it describes a similar structure that was thought to support and hold the earth in place. See how you translated this in Isaiah 24:18.

spread out the heavens

Yahweh speaks of creating the heavens as if they were fabric which Yahweh stretched out. See how you translated a similar phrase in Isaiah 42:5. (See: rc://en/ta/man/translate/figs-metaphor)

when I call to them, they stand up together

Standing up when Yahweh calls is a metaphor for being ready to obey him. Yahweh speaks of the earth and the heavens as if they were able to hear him and obey him. (See: rc://en/ta/man/translate/figs-metaphor and rc://en/ta/man/translate/figs-personification)

when I call to them

Possible meanings are 1) "when I call the earth and the heavens" or 2) "when I call the stars in the heavens."