It, referring back to the subject of Part A of the couplet in Job 28:3, is either mass or time.
He, she, it: ה֣וּא – hu or hi
Darkness: לַחֹ֗שֶׁךְ – choshek
During the formation of planet Earth, the action of the particles moving to form the core of the Earth is pictured in the sense of sinking into darkness and obscurity.
Gravitational Time Dilation
The Bible predicts time dilation as observed. It is caused by the operation of gravity according to our axiomatic definition, which is congruent with practical mathematical applications.
To put, place, set: שָׂ֤ם – sum
Setteth: שָׂ֤ם - sum [to put, place, set] The mass is in motion. It has been set in a place or it is in motion towards the place where it is to be set. This is the 3rd Hebrew concept of gravity which we have identified.
At the end of time: קֵ֤ץ – qets
This means end, limit, of space or time. Could we be talking about the end of all mass? Or are we talking about the end of time, as in, time stops?
Gravity as a Process
Mass sinks in time, into stratified layers of sediment: a solid core on fire in the darkness, sunk in the shadow of death. (Job 28:3) MP Technical Paraphrase
Time Dilation Math
We can calculate a distance to the firmament with the question: If GPS clocks are faster by 38,640 ns per day at an orbital radius of 26,541 km, what's the orbital radius when the clocks are faster by 1,000 years?
Wibbly Wobbly Timey Wimey… Stuff
On earth 1 day is equal to 1,000 years at the distance of the firmament, but at the firmament 1 day is equal to 1,000 years on earth. It's a paradox. It is also mathematically perfect in 2 Peter 3:8.
October 25th
Creation was ordered by establishing above (heaven) and below (Earth) through gravity. The created singularity is an assembly of souls where we all began.
October 11th
Time passes at a rate which is directly proportional to the distance between you and the center of the Earth.