Sidereus Nuncius, or Sidereal Messenger, a scientific work by Galileo Galilei
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Malayalam Calendar (also known as Malayalam Era or Kollavarsham or Kollam Era) is a solar and sidereal calendar used in Kerala, India.
Normally, a sidereal year is considered to be 365.25636 days long, but that only applies to stars on the ecliptic, or the apparent path of the Sun.