ກ່າວເຖິງວິທີການປ່ຽນວັນອຸໂປສົດໃນແຕ່ລະ ລະດູ ເຊິ່ງພະພິກຂຸອົງທີ່ສູດປາຕິໂມກຈະຕ້ອງປ່ຽນຄໍາສູດ ນັ້ນໃຫ້ກົງກັບແຕ່ລະ ລະດູ ອັນປະກອບໄປດ້ວຍ ໓ ລະດູຄື: ໑. ລະດູຝົນ ມີ ໔ ເດືອນ ຄື ຕັ້ງແຕ່ແຮມ ໑ ຄໍ່າ ເດືອນ ໘ ເຖິງຂຶ້ນ ໑໕ ຄໍ່າ ເດືອນ ໑໒ ມີ ໗ ອຸໂປສົດ ກັບ ໑ ປະວາລະນາອອກພັນສາ, ໒. ລະດູໜາວ ມີ ໔ ເດືອນ ຄື ຕັ້ງແຕ່ແຮມ ໑ ຄໍ່າ ເດືອນ ໑໒ ເຖິງຂຶ້ນ ໑໕ ຄໍ່າ ເດືອນ ໔ ມີ ໘ ອຸໂປສົດ, ໓. ລະດູຮ້ອນ ມີ ໔ ເດືອນ ຄື ຕັ້ງແຕ່ແຮມ ໑ ຄໍ່າ ເດືອນ ໔ ເຖິງຂຶ້ນ ໑໕ ຄໍ່າ ເດືອນ ໘ ມີ ໘ ອຸໂປສົດ ແຕ່ຫາກປີໃດມີອະທິກະມາດ ຄື ມີເດືອນ ໘ ສອງຫົນ ລະດູຮ້ອນຈະມີ ໑໐ ອຸໂປສົດ.
Tikarissasit (The book of the seasons for Uposatha). The content tells how to change the days for performing the Patimokkha ceremony in each season. The monk who recites the text of Patimokkha has to change Pali words which related to the day in three seasons including rainy season, winter and summer. 1. Rainy season has four months begins from on the first day of the waning moon of the eighth lunar month to on the fifteenth day of the waxing moon of the twelfth lunar month. There are seven times of the Uposatha day and one day of Pavarana (invitation to speak) on the day of the end of the rains-residence. 2. Winter has four months begins from on the first day of the waning moon of the twelfth lunar month to on the fifteenth day of the waxing moon of the fourth lunar month. There are eight times of the Uposatha day. 3. Summer has four months begins from on the first day of the waning moon of the fourth lunar month to on the fifteenth day of the waxing moon of the eighth lunar month. There are eight times of the Uposatha day. If the year has twice eighth months, there is ten times of Uposatha day.
Extent: 1 palm-leaf manuscript containing 5 leaves.
Size and dimensions of original material: Hight 4.9 cm, width 55.3 cm, depth 0.2 cm.
Condition of original material: Good.
Author(s)/Creator(s): Unidentified.
Scribe(s): Unidentified.
Original institution reference: Manuscript Cabinet No.1.
