The Cresian liturgical calendar is based on the Kelosian calendar on . The sidereal day of Crystaldeep is 1.603100 dd, and the sidereal year is 589.665507892 dd. Assuming a prograde rotation, the solar day is 1.607470165 dd. A tropical year is 589.642459865 dd or 366.813937075 solar days. This calendar has ten months and a ten-day week. The first, fourth, seventh months have 36 days. The second, third, fifth, sixth, eighth, and ninth months have 37 days. The last month has 36 days on non-leap years and 37 days on leap years. 06-01 is considered the midyear's day.