Romulan calendar

• Units
  • Ewa (Romulan second) (ENT Novel: The Good That Men Do)
  • Siure (Romulan minute) (ENT Novel: The Good That Men Do, Beneath the Raptor's Wing)
    • Plural: siuren (ENT Novel: Beneath the Raptor's Wing)
    • Approximately 50 seconds (ENT Novel: Beneath the Raptor's Wing)
      • 12 siuren is equal to "a little over ten minutes" by that work
  • Dierha (Romulan hour) (ENT Novel: The Good That Men Do)
  • Eisae (Romulan day) (ENT Novel: The Good That Men Do)
    • Also known as a ch'Rihanturn (ENT Novel: Beneath the Raptor's Wing)
  • Khaidoa (Romulan month) (ENT Novel: The Good That Men Do, Kobayashi Maru, Beneath the Raptor's Wing)
  • Fvheisn (Romulan year) (ENT Novel: The Good That Men Do, Beneath the Raptor's Wing)
    • 11-12 khaidoa to a fvheisn (ENT Novel: Beneath the Raptor's Wing)
      • six khaidoa is "half a fvheisn or more" by that work
• Months
  • Tasmeen (ENT Novel: The Good That Men Do)
    • At least twenty-one days (ENT Novel: The Good That Men Do)
  • Havreen (ENT Novel: The Good That Men Do)
    • At least eight days (ENT Novel: The Good That Men Do)
    • Immediately follows Tasmeen
  • K'ri'lior (ENT Novel: Beneath the Raptor's Wing)
    • At least 44 days (ENT Novel: Beneath the Raptor's Wing)
    • Shortly after Tasmeen (ENT Novel: Beneath the Raptor's Wing)
      • "More than a full fvheisn" between Tasmeen 11 of the previous year and K'ri'lior 10 of that reference's
      • Havreen established as immediately after Tasmeen; possibly month immediately after that
  • et'Khior (ENT Novel: Beneath the Raptor's Wing)
    • At least 4 days (ENT Novel: Beneath the Raptor's Wing)
  • K'ri'Brax (ENT Novel: Kobayashi Maru)
    • At least 40 days (ENT Novel: Kobayashi Maru)
    • "A few khaidoa" after Havreen (ENT Novel: Kobayashi Maru)
      • Between February 23, 2155 (Coridan Prime attack, late Tasmeen/Havreen), and K'ri'Brax 29 (ENT Novel: Kobayashi Maru)
    • February 21, 2155 (late Tasmeen/early Havreen) "two khaidoa" before K'ri'Brax 33 (ENT Novel: Kobayashi Maru)
      • First event Ehrein's rescue from Rator II, Chapter 38 of The Good That Men Do
    • "Some three khaidoa" between Tasmeen 5 and K'ri'Brax 33 (ENT Novel: Kobayashi Maru)
      • Between Cunaehr's death, chapter 1 of The Good That Men Do, and chapter 11 of Kobayashi Maru
  • re'T'Khutai (ENT Novel: Beneath the Raptor's Wing)
    • Apparently immediately following K'ri'Brax by correspondences
    • At least 3 days (ENT Novel: Beneath the Raptor's Wing)
  • Khuti (ENT Novel: Beneath the Raptor's Wing)
    • At least 11 days (ENT Novel: Beneath the Raptor's Wing)
• Correspondences
  • Nearly three fvheisn between April 17, 2152 and early February 2155 (ENT Novel: The Good That Men Do)
    • Between "Minefield" and chapter 4 of The Good That Men Do
  • Mid-November 2154 "the previous fvheisn" from July 2155 (ENT Novel: Kobayashi Maru)
    • Between "Babel One"/"United"/"The Aenar" and chapter 11 of Kobayashi Maru
  • Late-January to early-February 2155 "more than a full fvheisn" before February 11, 2156 (ENT Novel: Beneath the Raptor's Wing)
    • Between chapter 4 of The Good That Men Do and chapter 39 of Beneath the Raptor's Wing
  • Tasmeen 5, year unknown > January 24, 2155 (ENT Novel: The Good That Men Do)
  • January 30, 2155 > Tasmeen 11, year unknown > February 3, 2155 (ENT Novel: The Good That Men Do)
  • February 9, 2155 = Tasmeen 21, year unknown (ENT Novel: The Good That Men Do)
  • March 3, 2155 > Havreen 8, year unknown > March 21, 2155 (ENT Novel: The Good That Men Do)
  • July 13, 2155 > K'ri'Brax 29, year unknown > July 14, 2155 (ENT Novel: Kobayashi Maru)
  • July 14, 2155 > K'ri'Brax 30, year unknown > July 15, 2155 (ENT Novel: Kobayashi Maru)
  • July 15, 2155 = K'ri'Brax 31, year unknown (ENT Novel: Kobayashi Maru)
  • July 16, 2155 > K'ri'Brax 33, year unknown > July 17, 2155 (ENT Novel: Kobayashi Maru)
  • July 22, 2155 = K'ri'Brax 37, year unknown (ENT Novel: Beneath the Raptor's Wing)
  • July 22, 2155 = K'ri'Brax 39, year unknown (ENT Novel: Kobayashi Maru)
  • July 22, 2155 > K'ri'Brax 40, year unknown (ENT Novel: Kobayashi Maru)
  • July 30, 2155 = re'T'Khutai 3, year unknown (ENT Novel: Beneath the Raptor's Wing)
  • November 8, 2155 = Khuti 11, year unknown (ENT Novel: Beneath the Raptor's Wing)
  • February 11, 2156 = K'ri'lior 10, year unknown (ENT Novel: Beneath the Raptor's Wing)
  • March 11, 2156 = K'ri'lior 39, year unknown (ENT Novel: Beneath the Raptor's Wing)
  • March 14, 2156 = K'ri'lior 42, year unknown (ENT Novel: Beneath the Raptor's Wing)
  • March 15, 2156 = K'ri'lior 43, year unknown (ENT Novel: Beneath the Raptor's Wing)
  • March 16, 2156 = K'ri'lior 44, year unknown (ENT Novel: Beneath the Raptor's Wing)
  • March 18, 2156 = et'Khior 2, year unknown (ENT Novel: Beneath the Raptor's Wing)
  • March 20, 2156 = et'Khior 4, year unknown (ENT Novel: Beneath the Raptor's Wing)
  • May 19, 2156 = T'ke'Tas 13, year unknown (ENT Novel: Beneath the Raptor's Wing)
  • June 20, 2156 = T'ke'Tas 43, year unknown (ENT Novel: Beneath the Raptor's Wing)
    • Incompatible with all other datapoints; ignore
  • September 29, 2156 = Early in the month of Khuti, year of D'Era 1181 (ENT Novel: To Brave the Storm)
• Calculations
  • Romulan day between 20h34m17s and 38h24m
    • 20h34m17s: Start of K'ri'Brax 31 = end of 7/15 and end of K'ri'Brax 37 = start of 7/22 (7 days in ~144 hours)
    • 38h24m: End of K'ri'Brax 31 = start of 7/15 and start of K'ri'Brax 37 = end of 7/22 (~5 days in ~192 hours)
  • Eisae between 22h24m and 25h42m51s
    • 22h24m: Start of K'ri'lior 10 = end of 2/11 and end of K'ri'lior 39 = start of 3/11 (30 days in ~672 hours)
    • 25h42m51s: End of K'ri'lior 10 = start of 2/11 and start of K'ri'lior 39 = end of 3/11 (~28 days in ~720 hours)
  • Eisae < 24h
    • July 22, 2155 = K'ri'Brax 37 - 39
  • Eisae thus in [22h24m,24h)
  • Earliest K'ri'Brax 38 can start is one moment after 7/22 0000, latest one moment before 7/22 0136
    • Thus K'ri'Brax 29 starts between 7/13 00:00 and 7/13 16:00
    • K'ri'Brax starts between 6/15 00:00 and 6/17 12:48
  • Tasmeen 21 = February 9 and K'ri'Brax 38 starting between 7/22 0000 and 7/22 0136 implies Tasmeen 21 between 163 and 174 Romulan days before K'ri'Brax 38 based on [22h24m,24h) interval
    • Tasmeen 5 thus between 179 and 190 eisae before K'ri'Brax 38
    • [22h24m,22h28m58s] interval for eisae length forces 174 days for Tasmeen 21, and thus 190 days for Tasmeen 5
    • However, this interval also forces Tasmeen 5 to start on 1/25
  • Thus eisae in [22h28m58s,24h)
  • Similar derivation for K'ri'lior 39 vs. 10 restricts interval further to [22h32m33s,24h)
  • re'T'Khutai 3 must be 8-9 Romulan days after K'ri'Brax 38 based on potential Romulan day lengths
    • Thus re'T'Khutai 1 is 6-7 Romulan days after K'ri'Brax 38, and so K'ri'Brax has 43-44 days
  • Conjectured calendar
    • Between 379 and 399 eisae between Tasmeen 1 in 2155 and K'ri'lior 1 in 2156
    • Conjectured orders with calculated spans
      • Tasmeen
        • Start 1/19 0000 - 1/22 0106
        • 27-53 days by potential positions of Havreen 1
          • Based on potential range of eisae counts from Havreen 8 correspondences
      • Havreen
        • Start 2/16 0000 - 3/20 2249
      • K'ri'lior
        • (Start 2/1/2156 0425 - 2/3/2156 2307)
        • 44 days
      • et'Khior
        • Start ????
        • Single intercalary "week"?
          • 146-155 days in [Tasmeen 1,K'ri'Brax 1)
          • Assuming consistent 44-day month, leaves 14-23 days for et'Khior
      • K'ri'Brax
        • Start 6/15 0000 - 6/17 0023
        • 43-44 days
      • T'ke'Tas
        • (Start 5/6/2156 0404 - 5/8/2156 1702)
        • 40-57 eisae between end of K'ri'lior and start of T'ke'Tas??
      • re'T'Khutai
        • Start 7/27 1621 - 7/29 0000
      • ???
      • ???
      • Khuti
      • ???
      • ???
• Overall summary: references to Romulan calendar are entirely inconsistent in 22nd century ENT novels, and just use CLB's calendar from DTI