I will first admit that much of my ideas about the pyramid complex are purely speculation, I refer to the annex of structures at the feet of the sphinx as the "sun temple(s)" though I have yet to find verification that this is the case.
One might surmise that the entire pyramid complex is a clock for measuring time eternal at least as eternal as very the stones that comprise its structures.
A stone/sun clock or channeled sun's energy.
I would put forth a hypothesis that the sun temple at the feet of the sphinx may have been a water clock thought the use of constant water channels would be detectable by erosion in the rocks and stones unless the water was cleverly employed in a manner to obscure this.
The fact that the "sun temple" had access to water may have been for baptismal purposes which are known to extend thousands of years before Christianity and/or it may have been employed to tell time.
I tend to think the sun temple(s) (we will call these two structures that precede the sphinx for simplicity sake) because the intricate corridors and passageways would have been perfect for observing the motion of the sun provided there was little or no roof and strategically placed windows much like Stonehenge and its pillars, their shadows and spaces were used to tell time.
As the sun would rise during the months corresponding to our August and September I am assuming the sun would shine directly west, thus it would illuminate the sun temple and sphinx face on.
The sphinx being built not only at a higher elevation than the sun temple and being roughly 66 feet tall (four stories) would overshadow the sun temple and catch the sun directly upon its face. while the pyramid behind the sphinx would also catch a reflection of the suns rays on the very top. Like a trinity - God (pyramid), sphinx (humanity) and sun temple (spirit).
Numbers 6
24 The LORD [sun] bless thee, and keep thee:
25 The LORD [sun] make his face shine upon thee, and be gracious unto thee:
26 The LORD [sun] lift up his countenance upon thee, and give thee peace.
( a blessing of Aaron while leaving Egypt with Moses)
Comment:
Notice the shadow the chin of the sphinx makes...
This shadow only occurs certain months of the year at roughly 11:00 or "the eleventh hour". (this I am guessing at and it would take a planetarium and computers to verify this claim going back thousands of years)
Unlike this photo where the shadow hits only the side of the sphinx at a pitched angle.
With all of the intricate passageways of the "sun temple" the path of the sun throughout the year would have moved from face to face in the gallery where the statues of Khafra were placed. Thus it could be said that on any given day and time the sun would have shone on the face (countenance) of Khafra nearly constantly or precisely when time would be measured.
Having water as a secondary clock would have given the Egyptian keepers of time a foolproof reckoning of time even if the sun were to inevitably not shine.
It would appear that Khafra was positioning himself to be not only the first but also the last and every hour in between.
Hours are time and time is numbers and numbers are synonymous to language of which the fundamental measurement of language is the word thus this represents "the word in the beginning".
The word was with God and the word was God.
A History of the Water Clock
https://en.wikipedia.org/wiki/Water_clock