What's the Name of That Book??? discussion

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The Root Cellar
SOLVED: Children's/YA
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SOLVED - Door in the ground that time warped based on time of day [s]
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It was possibly based in a farm setting, based decades ago, maybe turn of the century? There was a hatch or cellar door or something in the ground somewhere and based on the position of the sun and the shadows it cast at the right time it would send the main protagonist back in time - maybe 100 years? Maybe less?
I don't remember much else, except for a female character being in the past setting too.