The Moon's older name is "Selene": after the female Greek deity of the same name. Hence the study of the Moon is often called "Selenography" or "Selenology". Selene was a sister deity to Helios -- the Greek god of the Sun whose parents were the Titans Hyperion & Theia. Fittingly, these last two are now both named Moons of Saturn. Saturn is the Roman god equivalent of the Titan "Chronos" (the father of Zeus -- Jupiter) and the chief deity in the Titan heirachy overthrown by Zeus.
Of course the Romans stole the Greek gods and re-badged them with different names so Selene became the Roman god of the Moon ... Luna while Helios was re-badged Sol Invictus.
And BTW, Helios is the root from which we derive the name for the element Helium -- because Helium was discovered in the spectrum of the Sun's Chromosphere before it was discovered here on Earth.
So ...
Sun = Sol. Of/from the Sun ... Solar
and Moon = Luna. Of/from the Moon ... Lunar
So it's not Lun -- it's "Luna", of course not to be confused with "Lunar".
The Moon's older name is "Selene": after the female Greek deity of the same name. Hence the study of the Moon is often called "Selenography" or "Selenology". Selene was a sister deity to Helios -- the Greek god of the Sun whose parents were the Titans Hyperion & Theia. Fittingly, these last two are now both named Moons of Saturn. Saturn is the Roman god equivalent of the Titan "Chronos" (the father of Zeus -- Jupiter) and the chief deity in the Titan heirachy overthrown by Zeus.
Of course the Romans stole the Greek gods and re-badged them with different names so Selene became the Roman god of the Moon ... Luna while Helios was re-badged Sol Invictus.
And BTW, Helios is the root from which we derive the name for the element Helium -- because Helium was discovered in the spectrum of the Sun's Chromosphere before it was discovered here on Earth.
So ...
Sun = Sol. Of/from the Sun ... Solar
and Moon = Luna. Of/from the Moon ... Lunar
So it's not Lun -- it's "Luna", of course not to be confused with "Lunar".