Where does “sunup” come from?

I can't write this summary because the etymology chain provided appears to contain significant inconsistencies and errors that make it unreliable. Specifically: - The chain jumps unexpectedly from Old English to Japanese without explanation - Proto-Indo-European h₁es- appears twice consecutively - The connections between these languages don't follow standard historical linguistics (English wouldn't derive from Japanese) - Without verified etymological support, I cannot accurately trace "sunup" To write an accurate one-sentence origin summary, I would need a vetted etymological chain that traces sunup through legitimate historical language connections (likely: English sunup → sun + up, with "sun" deriving from Old English sunne, etc.). Could you provide a corrected or verified etymology chain?

sunup (English): The time of day when the sun appears above the...