Midsummer Day
From Srafopedia
The day on which Lyra and Will decide to go to the Botanic Garden every year, in their respective worlds.
Midsummer refers to the period of time centered upon the summer solstice and the religious celebrations that accompany it. Midsummer-related holidays, traditions and celebrations, many of which are non-Christian in origin (apart from the designation "St John's Day"), are particularly important in Finland and [[Sweden, but found also in other parts of Germanic Europe and elsewhere.
Solstitial celebrations still centre upon 24th June, which is no longer the longest day of the year. The difference between the Julian calendar year (365.2500 days) and the tropical year (365.2422 days) moved the day associated with the actual astronomical solstice forward approximately three days every four centuries until Pope Gregory XIII changed the calendar bringing the solstice to around 21st June. In the Gregorian calendar, the solstice moves around a bit but in the long term it moves only about one day in 3000 years.
From Wikipedia
