9 April - Monday

Birthday of "merry gas"
Day of Museums in the Netherlands
Jam en-Nessim in Egypt "the scent of the western wind" or "floral fragrance"

1699 Peter I issued a decree "On the observation of cleanliness in Moscow and about the punishment for throwing out rubbish and any droppings on the streets and lanes"
1966 The Vatican officially abolished the Index of forbidden books of writings of theologians, scientists and writers that existed for more than four centuries and published 32 editions of 12 of which were published already in the 20th century.

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