Unfortunately, you eventually "telegraph" your real motive for your circular, sola scriptura, one-sided reasoning in your absurd #52:
"The purpose of the light was to mark time, the revolving of the earth. To wit,"
There is zero relationship (either scriptural or scientific) between God's initial, omnidirectional but anisotropic, release of photons -- and the human convention of marking the angular position of light rays from the (later-formed, self-iluminated) sun, striking the "revolving" earth -- as a means of earthly time measurement.
The inevitable follow-on claim to your position edicts that the duration of the days ["yom"] of our eternal Creator God are dictated by the spin rate He imparted on this [created, then (later) formed] ball of dirt -- three Divine days after He caused light to be released from the "stuff" or "dark fire" of His original, simultaneous, instant creation of energy, time, matter, and space.
IOW, your statement is a vain, human scheme to dwindle almighty God down to human-comprehensible scope. There is nothing righteous, holy or worshipful in it; quite the opposite.
And, most certainly, there is no such "purpose" for "Let there be light", -- either stated or implied -- in Genesis.
Your above statement is a purely human-contrived vanity. I defy you to support it with Scripture. And I challenge you to relate it to the actual reality of God's created universe (which you scornfully ignore).
You would be well served to consider prayerfully this truth often stated by Alamo-Girl:
"Man is not the measure of God."
"Genesis: a Scientist Looks at the First Four Verses"
...especially from those (see #49, on another thread) who make a lifetime career of myopically stirring the same 31 sentences in Genesis in hubristic efforts to twist them to their (or their preacher's') Homocentric purposes -- and doing so while blissfully ignoring (or demeaning) His other revelations (including the wondrous universe and creatures He created and formed).
Romans 1:20 "For the invisible things of him from the creation of the world are clearly seen, being understood by the things that are made, even his eternal power and Godhead; so that they are without excuse:"
King James Version (KJV)
"...and the human convention of marking the angular position of light rays from the (later-formed, self-iluminated) sun, striking the "revolving" earth -- as a means of earthly time measurement."
The timing convention for Earth and its inhabitants, was, obviously, ordained and provided for by our Creator, Himself:
Gen 1:14 "And God said, “Let there be lights in the vault of the sky to separate the day from the night, and let them serve as signs to mark sacred times, and days and years, 15 and let them be lights in the vault of the sky to give light on the earth.” And it was so. 16 God made two great lights—the greater light to govern the day and the lesser light to govern the night. He also made the stars. 17God set them in the vault of the sky to give light on the earth, 18to govern the day and the night, and to separate light from darkness. And God saw that it was good. 19And there was evening, and there was morning—the fourth day."
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Nonetheless, the special and specific formation ("making") of Sun & moon ("God made two great lights") relative to the "rotating" Earth was totally separate and distinct from the initial, fundamental release of light, itself, (photons) ["Let there be light."] on the first day.
The erroneous "human" convention" is in insisting that the pace of God's days in Heaven is in any way influenced by (or related to) the statements in Gen 1:14-19.
In fact, God, Himself, specifically states-- in both the Old and New Testaments -- that is NOT the case:
Psalm 90:4 "For a thousand years in thy sight are but as yesterday when it is past, and as a watch in the night." (KJV)and...
2 Peter 3:8 "But, beloved, be not ignorant of this one thing, that one day is with the Lord as a thousand years, and a thousand years as one day." (KJV)
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I apologize for my hasty proofreading.