Quotidian

Quotidian is the name given to the rate used in secondary progressions. The most commonly used rate is called Q2 and it is based on the ratio of 1 tropical day for a year (1 : 365.24219879). An alternate rate is called Q1 or Bija correction and is based on the ratio of 1 sidereal day for a year (1 : 366.2563992).