When?

mid-December
the middle part of December
 
Nivose
fourth month of the Revolutionary calendar (December and January); the snowy month
 
nap
a period of time spent sleeping
 
rainy day
a (future) time of financial need
 
366 days
a calendar year with an extra day added in February
 
Transfiguration Day
(Christianity) a church festival held in commemoration of the Transfiguration of Jesus
 
bronze age
(classical mythology) the third age of the world, marked by war and violence
 
Platonic year
time required for one complete cycle of the precession of the equinoxes, about 25,800 years
 
indiction
a 15-year cycle used as a chronological unit in ancient Rome and adopted in some medieval kingdoms
 
mid-August
the middle part of August
 
15 August 1945
the date of Allied victory over Japan, World War II
 
religious festival
a festival having religious significance
 
rag day
a day on which university students hold a rag
 
eve
the period immediately before something
 
infancy
the early stage of growth or development
 
Washington's Birthday
the day on which George Washington is remembered
 
St Martin's Day
the feast of Saint Martin; a quarter day in Scotland
 
Victorian age
a period in British history during the reign of Queen Victoria in the 19th century; her character and moral standards restored the prestige of the British monarchy but gave the era a prudish reputation
 
sabbatical leave
a leave usually taken every seventh year
 
incubation period
the period between infection and the appearance of symptoms of the disease
 
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