What specific date is illustrated for the Northern Hemisphere in the diagram below? 
Definitions:
DRG
Diagnosis-Related Group, a system to classify hospital cases into groups for the purposes of payment.
Post-op Anemia
A condition characterized by a reduction in red blood cells or hemoglobin in the bloodstream, occurring after a surgical operation.
Coronary Artery Bypass Graft
A surgical procedure to improve blood flow to the heart by diverting blood around narrowed or blocked coronary arteries.
IPPS
An acronym typically standing for 'Inpatient Prospective Payment System', a method used by Medicare to pay for hospital stays.
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