seven sleepers' day

/S EH1 V AH0 N S L IY0 P ER0 Z D EY0/
noun
  1. 1

    June 27 in Germany (Siebenschläfertag), a day whose weather is supposed to determine the average weather of the next seven weeks.

  2. 2

    July 27 in Finland and Scandinavia, known as the National Sleepy Head Day in Finland

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