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Re:American Academy of Sleep Medicine calls for elimination ... by CydeWeys on Monday August 31, 2020 @02:36PM (#24334552)
You need to multiply by 2 because it's drifting both before and afterwards, hence a little over 30 minutes of total drift.
Re:American Academy of Sleep Medicine calls for elimination ... by _ph_ on Tuesday September 01, 2020 @06:59AM (#24340432)
For the question of the symmetry, only the difference to the noon point is relevant.