Lithuanian calendar

Lithuanian researcher Libertas Klimka [lt] proposed that there was a simple astronomical observatory on the Birutė Hill in Palanga before the Christianization of Lithuania.

It was an iron stick 68.6 centimetres (27.0 in) in length covered in brass tin with small golden nails that formed various symbols grouped in a spiral of 39 rows.

The original was lost at the end of the 19th century, but copies were made and one is kept at the National Museum of Lithuania.

A copy owned by the historian Teodor Narbutt was studied and described by the Russian astronomer Matvey Gusev who argued that the symbols marked lunar months and days.

[4] The Russian Revolution of 1917 re-instated the Gregorian calendar, which had been the Western European standard for over a century, in January 1918.